chemistry essay and objective neco 2021

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NECO Chemistry Questions and Answers 2022/2023 Theory & OBJ Expo

March 29, 2022

Getting NECO Chemistry Questions 2021/2022 with solved NECO chemistry answers 2021 before the exam had been a big dream for candidates looking for NECO Chemistry questions and answers in 2021

That is the reason we are sharing this NECO chemistry expo 2021 with candidates so that they will not be stranded during the exam.

Proper usage of this material will guarantee you sure insights on the kind of NECO questions for chemistry 2021 that you should expect and how to draft expo answers for them.

OBJ (Paper 1)NECO Questions and Answers for Chemistry 2021.

The chemistry questions and answers for NECO 2021 will be in two papers. The first paper (paper 1) is the OBJ (objective) and the second paper is paper 2 (theory, essay, calculations and show working).

So in this aspect, I will supply you with the basic NECO chemistry questions 2021 samples with correct NECO chemistry answers 2021 to the NECO 2021 chemistry questions and answers samples.

Check out the sample solved Questions and Answers below.

Solved Chemistry Answers
Practice Chemistry Questions and answers
Secret on how to pass NECO 2021

Sample OBJ Chemistry Questions and Answers for NECO 2021

Solved NECO Chemistry Questions and Answers 2020/2021 for Theory & OBJ. Check free expo runs for chemistry objective and essay papers..

Download NECO 2021 Syllabus for Chemistry

1. Who found the Periodic table?

Period Dickson
John Dalton

The correct answer is D. Mendeleev

2. Periodic table is arranged in ____and _____

Lanthanide and Actinide
Groups and periods
Groups and electronic configuration
Atomic number and outer shell
Transition and atomic shell

The correct answer is B. Groups and periods

3. Which of these is not a constituent of Urine.

The answer is E. Bacteria

4. Bronze is made up of _____ and _____?

Iron and copper
Tin and iron
Copper and tin
Nickel and iron
Zinc and copper

The answer is copper and tin

5. Which of the following is not a metalloids

The correct answer is D. Nickel

6. The most reactive non-metal is_____?

The correct answer is A. Fluorine

7. What is the I.U.P.A.C name of CH 3 CH 2 OH?

The correct answer is D. Ethanol

8. Which of these is not an aromatic compound

Acetophenone

The correct answer is E. Tulane

9. The chemical symbol for Silver is____?

The answer is B. Ag

10. An element with an atomic number of 16 will likely belong to group_____ on the periodic table.

The answer is E.6

11. Group 7 elements are also known as _______?

Alkali metals
Transition elements.
Alkali earth metals.

The correct answer is A. Halogens

Get answers for chemistry practical paper

Theory Paper 2, Chemistry Questions and answers 2021 Samples

These are NECO 2021 theory Chemistry Questions and answers 2021 Samples for paper 2. This is the second paper (paper 2) and it is an “essay, calculations and show working section”.

Practice these questions because they might come up in the exam.

1. a. State Faraday’s first law of electrolysis.

Faraday’s first law of electrolysis states that the mass (m) of a substance liberated at an electrode during electrolysis is directly proportional to the quantity of electricity (Q) passing through the electrolyte.

Mathematically;

Where quantity of electricity = current (I) x time (t).

i.e Q = It.

ii. Explain an electrolytic cell.

An electrolytic cell consists of a container of electrolytes with two electrodes connected to a suitable direct current supply.

2a. List 4 constituents of Air.

Carbon (iv) oxide
Rare gases.

2b. Write the IUPAC name of CH 2 OH CHOHCHO: Ans. 2, 3-Dihydroxy propanal.

3. When 4.5g of liquid water was formed by burning hydrogen gas in oxygen, -72KJ of heat was given off. Calculate the standard heat of the formation of water.

Equation of reaction.

H 2(g) + 1 / 2 O 2(g) → H 2 O(l) ∆H © f = ? KJmol -1 .

4.5g of liquid water produces -72KJ of heat

1.0g of liquid water produces – 72

= -16.0KJ of heat

Therefore, 18g of liquid water will produce: (16.0 x 18) KJ of heat = -288KJmol -1

4. Define the following terms:

Bomb calorimeter
Heat of fusion
Spontaneous reaction
Gibbs free energy.

Bomb calorimeter: A bomb calorimeter consists of a strong cylindrical steel vessel lined with enamel to prevent corrosion.

The heat of fusion: This is the heat change when one mole of solid is melted.

Entropy: Entropy is a degree of disorderliness or randomness of a system.

Spontaneous reaction: A spontaneous reaction is a reaction that occurs on its own without the assistance of an external agent.

Gibbs free energy: The free energy (G), of a chemical system is the energy that is available for doing work.

NECO Expo for Chemistry exam 2021 (Important terms)

Now that you have gotten some sample NECO chemistry theory and OBJ questions for 2021 to practice with, let me give you a quick and common expo hint for Chemistry exam 2021 (Important terms to note)

IUPAC: IUPAC means, International Union of Pure and Applied Chemistry.

Nucleus: The Nucleus is made up of Proton and neutron.

Laws of Chemical combination includes;

Law of conservation of mass
The law of definite proportions or constant composition.
Law of multiple proportions.

Chemical symbol: A chemical symbol of an element represents an atom of the element.

Radicals: Radicals are groups of an atom carrying charges that keep their identity and react as a single unit.

Empirical formula: Empirical formula is the simplest possible formula giving the ratio of atoms in a molecule of the compound.

Mole: A mole is the amount of substance that contains as many elementary entities as that in a 12g of carbon.

Isotope: An isotope occurs in elements with the same atomic number (Number of protons) but different mass numbers (because of varying numbers of neutrons).

The Avogadro’s Number (N A ) is 6.02×1023

PH scale: the PH scale is numbered from 0 – 14. From 0 to 6 indicates the degree of acidity, 7 is neutral while, above 7 to 14 indicates the degree of alkalinity.

I am sure these NECO Chemistry Questions and answers 2021 material will help you to perform better in this exam.

Please, treat the above questions as sample questions and not as the main exam questions.

Thanks a lot

you’re welcome.

Thanks for your help

Thanks so much for your help

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NECO Past Questions 2021

December 18, 2023 Victoria Jackson NECO , Past Questions 0

NECO Past Questions 2021 – NECO past questions and answers for all subjects are now available for download in PDF format. NECO past questions will help boost your score and overall performance in the 2021 NECO examination. These past questions and answers are created to help all prospective undergraduate students who are searching for NECO past questions for both science and art subjects.

NECO exam’s past questions and answers are provided here for download. If you are one of them, then we wish you good luck as you embark on your journey to write this year’s examination. We have uploaded up-to-date NECO past questions to help you during your preparation.

Why you need NECO Past Questions 2021

The more you practice with past exam questions, the more you sharpen your skills. These papers help you to recall what you have been learning in your class. Besides, it allows you to apply the concepts you have been mastering during your study times. Therefore, past exam papers are a perfect option in your revision for your upcoming exams.

NECO Past Questions 2021 Pattern

NECO Past Questions 2021 follow the original pattern, usually in multiple-choice format. We have made it very easy for you. We bring all the questions for many years and put them together but indicate the specific years of their occurrence. We provide the correct answers to save you time.

All you need to do is devote quality time to studying the NECO Past Questions 2021 and watch yourself change the narrative by scoring better than you expected in the examination.

Sample of NECO Past Questions 2021

A. development of secondary sexual characteristics B. onset of the heat period C. milk let–down after parturition D. development of udder

A. 0.83 kg B. 1.21 kg C. 1.28 kg D. 2. 25kg

A. the eggs cannot be candled B. the chicks are less healthy C. the brooding hens sometimes abandon the eggs D. it takes a longer time for eggs to hatch

A. increase water intake B. provide bulk to feed C Reduce microbial activity D. provide deficient nutrients

A. Aspergillosis B. Acidosis C. Milk fever D. Rickets

A. potential energy B. mechanical energy C. nuclear energy D. solar energy E. kinetic energy

A. harrow B. ridge C. cultivator D. planter E. plough

The complete NECO Past Questions 2021 with accurate answers is N2,000.

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Our past questions and answers are original and from the source. So, your money is in the right hands and we promise to deliver it once we confirm your payment.

Each year, thousands of students gain admission into their schools of choice with the help of our past questions and answers. Pastquestions.com.ng

7 Tips to Prepare for NECO Exams

Don’t make reading your hobby: A lot of people put reading as a hobby in their CV, they might be right because they have finished schooling. But “You” are still schooling, so reading should be a top priority, not a hobby. Read far and wide to enhance your level of aptitude
Get Exams Preparation Materials: These involve textbooks, dictionaries, Babcock University Post UTME Past Questions and Answers, mock questions, and others. These materials will enhance your mastery of the scope of the exams you are expecting.
Attend Extramural Classes: Register and attend extramural classes at your location. This class will help you refresh your memory and boost your classroom understanding and discoveries of new knowledge.
Sleep when you feel like: When you are preparing for any exams, sleeping is very important because it helps in the consolidation of memory. Caution: Only sleep when you feel like it and don’t oversleep.
Make sure you are healthy: Sickness can cause excessive feelings of tiredness and fatigue and will not allow you to concentrate on reading. If you are feeling as if you are not well, report to your parent, a nurse, or a doctor. Make sure you are well.
Eat when you feel like it: During the exam preparation period, you are advised not to overeat, and to avoid sleep. You need to eat little and light food whenever you feel like eating. Eat more fruits, drink milk and glucose. This will help you enhance retention.
Reduce your time on social media: Some people live their entire lives on Facebook, Twitter, WhatsApp, Messenger chat. This is so bad and catastrophic if you are preparing for exams. Try and reduce your time spent on social media during this time. Maybe after the exams, you can go back and sleep in it.

If you like these tips, consider sharing them with your friends and relatives. Do you have a question or comments? Put it on the comment form below. We will be pleased to hear from you and help you score as high as possible. myPastQuestion.com .

We wish you good luck!

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How to Pass NECO Chemistry: Objective and Essay Questions and Answers Explained (With Examples)

Chemistry is one of the core subjects in the Senior Secondary Certificate Examination (SSCE) administered by the National Examinations Council (NECO). It is a required subject for students who wish to study science-related courses at a higher institution. As a result, it is important to properly prepare for the NECO chemistry exam and score high marks.

In this article, we will provide you with some helpful information on how to prepare for the NECO chemistry exam, as well as some sample questions and answers for both the objective and essay sections. We will also give you some helpful tips on how to answer the questions correctly and avoid typical mistakes.

What is NECO Chemistry Exam?

The NECO chemistry exam is a test of your knowledge and comprehension of the fundamental ideas and principles of chemistry. It covers subjects like organic chemistry, physical chemistry, analytical chemistry, chemical reactions, the periodic table, and environmental chemistry. It also covers topics like atomic structure and chemical bonding.

The NECO chemistry exam is divided into two sections: Paper 1 consists of 60 multiple-choice questions that must be answered in one hour. Paper 2 contains two sections: Section A (Theory) and Section B (Practical). Section A contains six essay questions, four of which must be answered in two hours. Section B contains three practical questions, one of which you must answer in one hour.

The NECO chemistry exam has a total of 200 marks . Paper 1 carries 60 marks , Paper 2 Section A carries 80 marks , and Paper 2 Section B carries 60 marks . To pass the exam, you must score at least 50% on each paper.

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How to Prepare for NECO Chemistry Exam?

You must do the following to properly prepare for the NECO chemistry exam:

Thoroughly study the NECO chemistry syllabus and understand the objectives and outcomes of each topic.
Review your class notes and textbooks on a regular basis to ensure you understand the key concepts, formulas, definitions, laws, and equations.
Practice answering past questions and answers from previous years’ exams and mock tests. You can get them online or in bookstores.
Revise your weak areas and clarify any uncertainties with your teachers or classmates.
Attend revision classes or tutorials, if possible, and learn from your instructors’ feedback and corrections.
Prepare your practical materials and equipment in advance, and become familiar with the procedures and safety rules.
Before the exam, eat well, sleep well, and stay healthy. Avoid stressful situations and distractions that can affect your concentration and performance.

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NECO Chemistry Objective Questions and Answers 2023

The objective section of the NECO chemistry exam tests your ability to recall facts, recognize concepts, apply principles, analyze data, and solve problems. For each question, you must select the correct option from four alternatives (A, B, C, or D).

Here are some sample objective questions and answers for the NECO chemistry exam 2023:

Which of the following elements has the highest electronegativity?

A) Fluorine B) Chlorine C) Oxygen D) Nitrogen Answer: A) Fluorine

2. What is the name of the compound with the formula CH₃COOH?

A) Methanoic acid B) Ethanoic acid C) Propanoic acid D) Butanoic acid Answer: B) Ethanoic acid

3. What is the oxidation number of sulfur in SO₄²⁻?

A) +2 B) +4 C) +6 D) +8 Answer: C) +6

4. What type of reaction occurs when zinc reacts with hydrochloric acid?

A) Combination reaction B) Decomposition reaction C) Displacement reaction D) Neutralization reaction Answer: C) Displacement reaction

5. What is the empirical formula of benzene?

A) CH B) CH₂ C) C₂H₂ D) C₂H₄ Answer: B) CH₂

Tips for Answering Objective Questions

To answer the objective questions correctly, you need to follow these tips:

Carefully read the question and fully understand what it is asking.
Remove any options that are obviously incorrect or irrelevant.
Choose the best option that fits the question based on your knowledge of chemistry and logic.
If you are not sure of the answer, make an educated guess based on clues from the question or the options.
Don’t spend too much time on one question. If you get stuck, move on to the next one and come back later if you have time.
On the answer sheet, write your answers clearly and neatly. Do not make any stray marks or erase any marks.

NECO Chemistry Essay Questions and Answers 2023

The NECO chemistry exam essay section tests your ability to explain concepts, describe processes, compare and contrast phenomena, evaluate arguments, and communicate effectively. For each question, you must write detailed and coherent answers.

Here are some sample essay questions and answers for the NECO chemistry exam 2023:

(a) Define the following terms:

(i) Atomic number (ii) Mass number (iii) Isotopes (b) Write the electronic configuration of the following elements: (i) Sodium (ii) Magnesium (iii) Chlorine (c) Draw the dot-and-cross diagram of sodium chloride.

(a) (i) The atomic number is the number of protons in the nucleus of an element’s atom. It determines the element’s identity as well as its chemical properties.

(ii) Mass number is the sum of the number of protons and neutrons in the nucleus of an atom of an element. It determines the mass and stability of the atom.

(iii) Isotopes are atoms of the same element with different numbers of neutrons in their nuclei. They have the same atomic number but different mass numbers.

(b) (i) Sodium has an atomic number of 11 and a mass number of 23. Its electronic configuration is 2,8,1 or 1s²2s²2p⁶3s¹.

(ii) Magnesium has an atomic number of 12 and a mass number of 24. Its electronic configuration is 2,8,2 or 1s²2s²2p⁶3s².

(iii) Chlorine has an atomic number of 17 and a mass number of 35. Its electronic configuration is 2,8,7 or 1s²2s²2p⁶3s²3p⁵.

(c) Sodium chloride is formed when one electron is transferred from sodium to chlorine, resulting in the formation of sodium ion (Na+) and chloride ion (Cl).

2. (a) State two differences between metals and non-metals based on their physical properties. (b) Give two examples of metals and two examples of non-metals. (c) Explain why metals are good conductors of electricity.

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(a) The following are two physical property distinctions between metals and nonmetals:

Nonmetals have low melting and boiling points, whereas metals have high melting and boiling points.
Metals are malleable and ductile, whereas nonmetals are brittle and easily broken.

(b) Two examples of metals are iron and copper . Two examples of non-metals are oxygen and carbon .

(c) Metals are good conductors of electricity because their outermost shells contain free electrons that can easily move through the metal lattice when a potential difference is applied across it. These free electrons transfer electric charge from one end to the other, resulting in an electric current.

3. (a) Define the term acid-base titration. (b) List two types of indicators used in acid-base titrations and state their colour changes. (c) Write a balanced equation for the reaction between hydrochloric acid and sodium hydroxide.

(a) Acid-base titration is a laboratory technique for determining the concentration of an acid or a base by neutralizing it with a known-concentration standard solution of the opposite type.

(b) Two types of indicators used in acid-base titrations are:

Methyl orange: In acidic solutions, it turns red; in alkaline solutions, it turns yellow.
Phenolphthalein: In acidic solutions, it is colorless; in alkaline solutions, it is pink.

HCl + NaOH → NaCl + H₂O

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In this article, we have provided you with some useful information on how to prepare for the NECO chemistry exam in 2023, as well as some sample questions and answers for both the objective and essay sections. We hope that this article will help you pass the exam and achieve your academic goals. Goodluck in your exams!

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NECO Chemistry Questions and Answers 2023 Objectives and Essay

Post author: Study Admin
Post published: October 26, 2023
Post category: School News
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NECO chemistry 2023 answers are now available. NECO chemistry questions and answers 2023/2024 objective and essay and other exam details for NECO 2023 are on this page. See the 2023 NECO chemistry answers for both objective and theory below. Get the NECO chemistry objective and essay answers here.

The 2023 chemistry NECO OBJ and theory questions and answers are provided here for free. All you have to do is to go through the questions and take note of the NECO chemistry answers 2023. Read on to find out.

NECO Chemistry Questions and Answers 2023 Objective and Essay

Have you been searching on Google in order to get the NECO chemistry questions and answers 2023? If so, we have got you covered!

We have the 2023 NECO chemistry questions and our team of experts will soon upload the NECO chemistry questions and their accurate answers to help you pass the 2023 NECO chemistry examination.

The 2023 NECO chemistry theory questions and OBJ will be uploaded any moment from now. So if you are searching for the NECO chemistry answers 2023 for objective and theory, then you are on the right page. See NECO chemistry objective and essay questions and answers below.

NECO Chemistry Answers 2023 Objective and Theory

The National Examination Council (NECO) is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Education in June/July and November/December respectively.

The 2023 NECO chemistry questions are set from the SS1 to SS3 chemistry syllabus. So all the questions you will encounter in this year’s examination are in the syllabus, and nearly 95% of the questions are repeated.

You don’t have to worry about the 2023 NECO chemistry questions and answers PDF (essay and objective). The NECO chemistry answers 2023 will be uploaded any moment from now. All you need to do is to keep refreshing this page so as not to miss out.

Once again, keep refreshing this page because we will upload the original NECO chemistry questions and answers for this year’s exams on this page at any moment from now. Also, to download the past questions and answers, click on this link NECO chemistry past questions .

If you have any questions about the NECO chemistry questions 2023 and answers, feel free to use the comment box below or use the Chat With Us button and we will respond immediately.

The 2023 NECO chemistry answers will be posted here. Be patient. Keep checking and reloading this page for the correct answers. NECO 2023 chemistry answers loading…….

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NECO Chemistry Questions and Answers 2023/2024 (Essay and Objectives)

NECO Chemistry Questions and Answers 2023. I will be showing you past Chemistry objectives and theory repeated questions for free in this post. You will also understand how NECO Chemistry questions are set and how to answer them.

The National Examinations Council (NECO) is an examination body in Nigeria that conducts the Senior Secondary Certificate Examination and the General Certificate in Education in June/July and December/January respectively.

Table of Contents

NECO Chemistry Objectives and Essay Answers 2023 (Expo)

The 2023 NECO Chemistry expo will be posted here today 24th July during the NECO Chemistry examination. Keep checking and reloading this page for the answers.

NECO 2023 Chemistry Answers Loading.

OBJ Answers:

1-10: DEADADECAD

11-20: BAEDDBDBAE

21-30: CCDCABDDCD

31-40: EBEECEBCEE

41-50: BCCECDDADD

51-60: DABBDEAECA

————————————————————————————————————-

NECO Chemistry Questions and Answers For Practice

The following NECO Chemistry questions are questions to expect in the 2023 NECO examination.

1. The minimum amount of energy required for effective collisions between reacting particles is known A) Activation energy B) Bond energy C) Kinetic energy D) Potential energy

2. The bond formed between H2OH2O and H+H+ to form the hydroxonium H3O+H3O+ is A) Dative B) Covalent C) Electrovalent D) Ionic

3. An element XX forms the following oxides X2O,XOX2O,XO and XO2.XO2. This phenomenon illustrates the law of ________. A) Conservation of mass B) Definite proportion C) Mass action D) Multiple proportion

4.. How many moles of oxygen would contain 1.204×10241.204×1024 molecules? NB: Avogadro’s constant (NA) =6.02×1023=6.02×1023 A) 1 B) 2 C) 3 D) 4

See: NECO Timetable

5. Which of the following statements about solids is correct? A) Solid particles are less orderly than those of a liquid B) Solid have lower densities than liquids C) Solid particles have greater kinetic energies than those of liquids D) Solid particles cannot be easily compressed

6. Which of the following apparatus can be used to measure a specific volume of a liquid accurately? A) Beaker B) Conical flask C) Measuring cyclinder D) Pipette

7. The general gas equation PVT=KPVT=K is a combination of A) Boyle’s and Charles’ laws B) Boyle’s and Graham’s laws C) Charles’ and Graham’s laws D) Dalton’s and Graham’s laws

8. The spreading of the scent of a flower in a garden is an example of? A) Brownian motion B) Diffusion C) Osmosis D) Tynadal effect

9. Propane and carbon (IV) oxide diffuse at the same rate because [H = 1.00, C = 12.0, O = 16.0] Options A) They are both gases B) Their molecules contain carbon C) They have the same relative molecular mass D) Both are denser than air

1O. The energy which accompanies the addition of an electron to an isolated gaseous atom is A) Atomization B) Electronegativity C) Electron affinity D) Ionization

11. A sample of hard water contains some calcium sulphate and calcium hydrogen carbonate. The total hardness may therefore be removed by A. boiling the water B. adding excess calcium hydroxide C. adding a calculated amount of calcium hydroxide D. adding sodium carbonate E. adding magnesium hydroxide

12. During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment, A. the litmus turns blue but no gas is evolved B. the litmus turns blue and oxygen is evolved C. the litmus turns blue and hydrogen is evolved D. the litmus turns red and oxygen is evolved E. the litmus turns red and then becomes colourless

13. The reaction between an organic acid and an alcohol in the presence of an acid catalyst is known as; A. saponification B. dehydration C. esterification D. hydrolysis E. hydration

14. The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively; A. acetic acid and ethane B. ethanoic acid and ethene C. methanoic acid and ethylene D. ethanol and ethene E. acetic acid and ethylene

15. If 30cm3 of oxygen diffuses through a porous pot in 7 seconds, how long will it take 60cm3 of chlorine to diffuse through the same pot, if the vapour densities of oxygen and chlorine are 16 and 36 respectively? A. 9.3 sec B. 14 sec C. 21 sec D. 28 sec E. 30.3 sec

16. When heat is absorbed during a chemical reaction, the reaction is said to be A. thermodynamic B. exothermic C. isothermal D. endothermic E. thermostatic

17. When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as A. disintegration B. polymerization C. cracking D. degradation E. distillation

18. The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore A. none of these solutions is acidic B. the pH of Y is made more acidic by addition of distilled water C. Z is the most acidic solution D. W is the most acidic solution E. X is neutral

19. When each of the nitrates of Potassium, Magnesium and iron is heated, A. all the nitrates decompose to their oxides B. the nitrate of magnesium gives the nitrite and oxygen C. the nitrates of iron magnesium and iron give the oxides D. the nitrate of iron gives the nitrite and oxygen E. the nitrate of the magnesium is not decomposed

2O. Which of the following metals cannot replace hydrogen from water or steam? A. Sodium B. Magnesium C. Iron D. Calcium E. Copper

21. small quantity of solid ammonium chloride (NH4Cl) was heated gently in a test tube, the solid gradually disappears to produce two gases. Later, a white cloudy deposit was observed on the cooler part of the test tube. The ammonium chloride is said to have undergone A. distillation B. sublimation C. precipitation D. evaporation E. decomposition

22. Elements P, Q, R, S have 6, 11, 15, 17 electrons respectively, therefore, A. P will form an electrovalent bond with R B. Q will form a covalent bond with S C. R will form an electrovalent bond with S D. Q will form an electrovalent bond with S E. Q will form a covalent bond with R

23. An element X forms the following compounds with chlorine; XCl4, XCl3, XCl2. This illustrates the A. law of multiple proportions B. law of chemical proportions C. law of simple proportions D. law of conservation of mass E. law of definite proportions

24. The oxidation state of chlorine in potassium chlorate is A. +1 B. +2 C. +3 D. +5 E. +7

25. 10 When air which contains the gases Oxygen, nitrogen, carbondioxide, water vapour and the rare gases, is passed through alkaline pyrogallol and then over quicklime, the only gases left are; A. nitrogen and carbondioxide B. the rare gases C. nitrogen and oxygen D. nitrogen and the rare gases E. nitrogen, carbondioxide and the rare

26. Which of the following statements is NOT correct? A. The average kinetic energy of a gas is directly proportional to its temperature B. At constant tempearture, the volume of a gas increases as the pressure increases C. The pressure of a gas is inversely proportional to its volume D. The temperature of a gas is directly proportional to its volume E. The collisions of molecules with each other are inelastic

27. Zinc Oxide is a A. Basic Oxide B. Acidic Oxide C. Amphoteric Oxide D. Neutral Oxide E. Reactive Oxide

28. When sodium chloride and metallic sodium are each dissolved in water A. both processes are exothermic B. both processes are endothermic C. the dissolution of metallic sodium is endothermic D. the dissolution of metallic sodium is exothermic E. the dissolution of sodium chloride is explosive

29. The periodic classification of elements is an arrangement of the elements in order of their A. Atomic Weights B. Isotopic Weights C. Molecular Weights D. Atomic Numbers E. Atomic Masses

3O. In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid? A. 5cm3 B. 10cm3 C. 20cm3 D. 25cm3 E. 50cm3

Recommended: How to check NECO Result

NECO Chemistry Questions And Answers 2023 (Paper 2)

Don’t worry about these NECO Chemistry Questions And Answers 2023. All you need to do is to keep on refreshing this page for the 2023 NECO Chemistry Questions And Answers for this year. It will be posted here in few minutes.

Tips on How to Pass 2023 NECO Chemistry Examinations

The following guidelines will help you pass the 2023 NECO Chemistry examination with flying colours.

Have a Target and Work Towards Actualizing it

You have decided to pass NECO Chemistry 2023 and I am sure of that. Now, the next thing you should do is set targets.

You have told yourself, “I will score A in NECO Chemistry 2023”, that’s not all. You need to plan on how to make it happen. Create a timetable and master plan to achieve your goals.

Get the Recommended Textbook on Chemistry for 2023 NECO Examination

Normally, NECO recommends books for the examination. But apart from NECO Literature in English where certain novels are compulsory, you are free to use any good Chemistry textbook to prepare for NECO 2023 exam.

Some textbooks are more difficult to understand. If you have any topic you are finding difficult to understand, then get a textbook that will simplify the topics and make life better for you.

Do not Skip Chemistry Examples and Exercise you Will Come Across While Reading:

Many candidates are fond of skipping exercises and even examples while studying textbooks. In fact, we like notebooks so much that we could ask, “can I read my notebook and pass NECO Chemistry 2023?” Don’t be scared of attempting exercises in Biology. Face the challenges.

If you have any questions about the NECO Chemistry Questions and Answers 2023 , kindly drop your question in the comment box.

Last Updated on July 25, 2023 by Admin

122 thoughts on “NECO Chemistry Questions and Answers 2023/2024 (Essay and Objectives)”

Please when will the answer come up

I just need questions for the two

I am really greatfull for the coperation you showed to us most especially me if not for you guys thisneco would have been trouble so sincear thank you

WHERE IS THE ANSWER FOR THE OBJ QUESTIONS THAT IS UP THERE

Chemistry Past Questions

Download WAEC May/June App - Get all past questions and answers, 100% offline - 43208

Which of the following statements is NOT correct?

A. The average kinetic energy of a gas is directly proportional to its temperature
B. At constant tempearture, the volume of a gas increases as the pressure increases
C. The pressure of a gas is inversely proportional to the density
D. The temperature of a gas is directly proportional to its volume

Zinc Oxide is a?

A. Basic Oxide
B. Acidic Oxide
C. Amphoteric Oxide
D. Neutral Oxide
E. Reactive Oxide

When sodium chloride and metallic sodium are each dissolved in water

A. both processes are exothermic
B. both processes are endothermic
C. the dissolution of metallic sodium is endothermic
D. the dissolution of metallic sodium is exothermic
E. the dissolution of sodium chloride is explosive

The periodic classification of elements is an arrangement of the elements in order of their

A. Atomic Weights
B. Isotopic Weights
C. Molecular Weights
D. Atomic Numbers
E. Atomic Masses

In the reaction between sodium hydroxide and sulphuric acid solutions, what volume of 0.5 molar sodium hydroxide would exactly neutralise 10cm3 of 1.25 molar sulphuric acid?

Mathematics
English Language
Animal Husbandry
Literature in English
Accounts - Principles of Accounts
Christian Religious Knowledge (CRK)
Agricultural Science
Islamic Religious Knowledge (IRK)
Civic Education
Further Mathematics
Home Economics
Book Keeping
Data Processing
Catering Craft Practice
Computer Studies
Physical Education
Office Practice
Technical Drawing
Food and Nutrition
Home Management

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NECO Timetable for 2021 June/July Exam (Official)

NECO timetable 2021 for June/July examination is out and anyone can check it online. The National Examination Council, NECO SSCE (Internal) 2021 Examination Timetable is also available in PDF format and can be viewed on their official portal but we have made it easier to view here.

NGScholars wishes to inform you that the NECO Timetable for candidates who are preparing for the NECO June/July Senior School Certificate Examination (Internal) has been released.

Also in this post are the 2021 NECO June/July exam starting date and paper code for each subject.

You can check the NECO GCE Timetable (Nov/Dec) here if that is what you are looking for.

When Is NECO Starting In 2021?

According to the information on the NECO 2021 Timetable, the examination will start on 5TH JULY, 2021 and end on 16TH AUGUST, 2021 .

NECO Timetable 2021 for June/July Exam Details

The NECO SSCE internal has about seventy-six subjects.

1. Compulsory Cross-Cutting Subjects 2. Science and Mathematics 3. Technology 4. Humanities 5. Business Studies and 6. Trade/Entrepreneurship.

The minimum number of subjects a candidate can sit for is eight while the maximum is nine. All Senior Secondary schools in the Federation present Candidates for The National Examination Council SSCE Internal.

RECOMMENDED: NECO Registration Guidelines [June/July SSCE]

Check NECO Timetable 2021 for June/July SSCE.

The NECO SSCE internal has seventy-six subjects. Follow the link below to download the PDF version. [The PDF version contains the paper code and duration for each subject].

Monday 5th July to Friday 9th July (Actual date and time will be fixed by the Council)

Paper 1: Practical – Physical Education
Paper 1: Practical – Auto Mechanics
Paper 1: Practical – Woodwork
Paper 1: Practical – Home Management
Paper 1: Practical – Foods and Nutrition
Paper 1: Performance Test, Music Technology/Alternative
Paper IV: Aural Music
Paper IV: Oral French
Paper IV: Oral Arabic
Paper 1: Practical – Auto Body Repair and Spray Painting
Paper 1: Auto Electrical Work
Paper 1: Practical – Auto Mechanical Work
Paper 1: Practical – Air Conditioning and Refrigeration
Paper 1: Practical – Welding and Fabrication, Engineering Craft Practice
Paper 1: Practical – Electrical Installation & Maintenance Work
Paper 1: Practical – Radio, Television and Electronics Work
Paper 1: Practical – Blocklaying, Bricklaying and Concrete Work
Paper IV: Exhibition – Painting and Decoration
Paper 1: Practical – Plumbing and Pipe Fitting
Paper 1: Practical – Machine Woodworking
Paper 1: Practical – Carpentry and Joinery
Paper 1: Practical – Furniture Making
Paper 1: Practical – Upholstery
Paper 1: Practical – Catering Craft Practice
Paper 1: Practical – Garment Making
Paper 1: Practical – Clothing and Textiles
Paper IV: Exhibition – Dyeing and Bleaching
Paper IV: Exhibition – Printing Craft Practice
Paper 1: Practical – Cosmetology
Paper IV: Exhibition – Photography
Paper IV: Exhibition – Leather Goods, Manufacturing and Repair
Paper 1: Practical – GSM Maintenance and Repairs
Paper IV: Progressive Assessments – Animal Husbandry

Monday 12th July

Paper 1: Practical – Physics – 10:00am – 12:45pm
Paper 1: Test of Practical – Health Education – 2:00pm- 3:30pm
Paper III & II: Objective & Essay – Health Education – 3:35pm- 5:35pm

Tuesday 13th July

Paper 1: Practical – Data Processing – 10:00am – 1:00pm

Wednesday 14th July

Paper 1: Practical – Chemistry – 10:00am – 12:00noon
Paper 1: Written Comprehension – French – 2:00pm- 3:00pm
Paper II: Written Expression – French – 3:00pm- 4:45pm

Thursday 15th July

Paper 1(b): Painting and Decoration (Practical) – 10:00am- 4:00pm
Paper 1(b): Dyeing and Bleaching (Practical) – 10:00am – 4:00pm
Paper 1(b): Printing Craft Practice (Practical) – 10:00am – 4:00pm
Paper 1(b): Photography (Practical) – 10:00am – 4:00pm
Paper 1(b): Leather Goods Manufacturing and Repair (Practical) – 10:00am- 4:00pm
Paper 1: Practical – Mining – 10:00am – 12:00noon
Paper 1: Practical – Fisheries – 10:00am – 11:30am
Paper 1: Practical – Animal Husbandry – 10:00am – 11:30am
Paper 1: Practical – Stenography – 10:00am – 11:17am
Paper IV: Practical – Stenography (Word Processing) – 2:00pm- 4:00pm
Paper 1: Practical – Metal Work – 2:00pm- 5:00pm

Friday 16th July

Paper III & II: Objective & Essay – Air-Conditioning & Refrigeration – 10:00am – 11:40am
Paper III & II: Objective & Essay – Electrical Installation & Maintenance Work – 10:00am – 12:00noon
Paper III & II: Objective & Essay – Blocklaying, Bricklaying & Concrete Work – 10:00am – 12:00noon
Paper III & II: Objective & Essay – Machine Woodworking – 10:00am – 11:40am
Paper III & II: Objective & Essay – Carpentry & Joinery – 10:00am – 12:00noon
Paper III & II: Objective & Essay – Upholstery – 10:00am – 11:30am
Paper III & II: Objective & Essay – Stenography – 10:00am – 12:00noon
Paper III & II: Objective & Essay – Animal Husbandry – 10:00am – 12:00noon
Paper III & II: Objective & Essay – Fisheries – 10:00am – 12:00noon
Paper 1(a): Painting and Decoration (Report Writing) – 10:00am – 12:00noon
Paper 1(a): Dyeing and Bleaching (Report Writing) – 10:00am – 12:00noon
Paper 1(a): Printing Craft Practice (Report Writing) – 10:00am – 12:00noon
Paper 1(a): Photography (Report Writing) – 10:00am – 12:00noon
Paper 1(a): Leather Goods Manufacturing and Repair (Report Writing) – 10:00am – 12:00noon

Monday 19th to Wednesday 21st July

SALLAH BREAK

Thursday 22nd July

Paper 1: Practical – Biology – 10:00am – 12;00noon
Paper 1: Practical – Technical Drawing – 2:00pm- 5:00pm
Paper III & II: Objective & Essay – Store Management – 2:00pm – 4:40pm

Friday 23rd July

Paper III & 1: Objective & Practical / Physical – Geography – 10:00am – 12:30pm

Monday 26th July

Paper 1: Practical – Computer Studies – 10:00am- 1:00pm

Tuesday 27th July

Paper 1: Practical – Agricultural Science – 10:00am – 11:30am
Paper III & II: Objective & Essay – History – 2:00pm- 5:00pm
Paper 1: Drawing – Building Construction – 2:00pm- 5:00pm

Wednesday 28th July

Paper III & II: Objective & Essay – Chemistry – 10:00am- 1:00pm
Paper III & II: Objective & Essay – Auto Mechanics – 2:00pm – 4:30pm
Paper III & II: Objective, Theory & Practice – Financial Accounting – 2:00pm- 5:50pm

Thursday 29th July

Paper III & II: Objective & Essay – Physics – 10:00am- 1:00pm
Paper III & II: Objective & Essay – Civic Education – 2:00pm- 5:00pm

Friday 30th July

Paper III & II: Objective & Essay – Agricultural Science – 10:00am – 12:30pm

Monday 2nd August

Paper II & III: Essay & Objective – English Language – 10:00am – 12:45pm
Paper IV: Test of Orals – English Language – 1:00pm- 1:45pm
Paper III & II: Objective & Essay – Physical Education – 3:00pm- 5:00pm
Paper III & II: Objective & Essay – Building Construction – 3:00pm- 5:00pm

Tuesday 3rd August

Paper IV: Creative Design – Visual Art – 10:00am- 1:00pm –
Paper 1: Drawing – Visual Art – 2:00pm- 5:00pm
Paper 1: Practical – Basic Electricity – 2:00pm- 5:00pm

Wednesday 4th August

Paper III & II: Objective & Essay – Economics – 10:00am- 1:00pm
Paper III & II: Objective & Essay – Metal Work – 3:00pm – 5:30pm

Thursday 5th August

Paper III & II: Objective & Essay – Biology – 10:00am – 12:30pm
Paper III & II: Objective & Essay – Hausa – 2:00pm – 5:00pm
Paper III & II: Objective & Essay – Igbo – 2:00pm – 5:00pm –
Paper III & II: Objective & Essay – Yoruba – 2:00pm – 5:00pm
Paper ill & II: Objective & Essay – Edo – 2:00pm – 5:00pm
Paper III & II: Objective & Essay – Efik – 2:00pm – 5:00pm
Paper III & II: Objective & Essay – Ibibio – 2:00pm – 5:00pm

Friday 6th August

Paper II: Essay – Human and Regional Geography – 10:00am – 12:00noon
Paper III & II: Objective & Essay – Foods & Nutrition – 3:00pm-5:30pm

Saturday 7th August

Paper 1: Practical – Electronics – 10:00am – 1:00pm –
Paper III & II: Objective & Essay – Government – 10:00am – 12:40pm
Paper III & II: Objective & Essay – Home Management – 3:00pm- 5:30pm

Monday 9th August

Paper III: Objective – General Mathematics – 10:00am – 11:45am –
Paper II: Essay – General Mathematics – 12:00noon – 2:30pm
Paper III & II: Objective & Essay – Woodwork – 3:30pm- 5:30pm

Tuesday 10th August

Paper III & II: Objective & Essay – Auto-Body Repair and Spray Painting – 10:00am- 12:30pm
Paper III & II: Objective & Essay – Auto Electrical Work – 10:00am- 12:30pm
Paper III & II: Objective & Essay – Auto Mechanical work – 10:00am- 12:30pm
Paper III & II: Objective & Essay – Auto Parts Merchandising – 10:00am-12:15pm
Paper III & II: Objective & Essay – Welding & Fabrication Engineering Craft Practice – 10:00am- 1:00pm
Paper III & II: Objective & Essay – Radio, Television & Electronics Work – 10:00am – 12:30pm
Paper III & II: Objective & Essay – Plumbing St Pipe Fitting – 10:00am- 12:30pm
Paper IV: Drawing & Design – Furniture Making – 10:00am – 12:00noon
Paper III & II: Objective & Essay – Furniture Making – 12:30pm- 2:15pm
Paper III & II: Objective & Essay – Catering Craft Practice – 10:00am – 12:30pm
Paper III & II: Objective & Essay- Garment Making – 10:00am – 12:30pm –
Paper III Si II: Objective & Essay – Clothing St Textiles – 10:00am – 12:30pm
Paper III & II: Objective & Essay – Cosmetology – 10:00am – 12:30pm
Paper III & II: Objective & Essay – Minning – 10:00am-12:45pm
Paper III & II: Objective & Essay – Tourism – 10:00am- 1:30pm
Paper III Si II: Objective & Essay – Data Processing – 10:00am- 1:00pm
Paper III & II: Objective & Essay – Store Keeping – 10:00am – 12:40pm
Paper III & II: Objective & Essay – Book Keeping – 10:00am – 1:50pm
Paper III & II: Objective & Essay – GSM Maintenance St Repairs – 10:00am – 1:00pm
Paper III Si II: Objective & Essay – Marketing – 10:00am-12:40pm
Paper III & II: Objective & Essay – Salesmanship – 10:00am-12:40pm
Paper III & II: Objective & Essay – Electronics – 2:30pm – 4:30pm
Paper III & II: Objective & Essay – Office Practice – 2:30pm- 5:30pm

Wednesday 11th August

Paper III & II: Objective & Essay – Commerce – 10:00am – 12:40pm
Paper III & II: Objective & Essay – Basic Electricity – 10:00am – 12:15pm
Paper III & II: Objective & Essay – Music – 2:00pm – 4:30pm
Paper III & II: Objective & Essay – Visual Art – 2:00pm – 5:00pm

Thursday 12th August

Paper III & IV: Objective Si Drawing – Technical Drawing – 10:00am- 12:30pm
Paper III & II: Objective, Essay St Literature – Arabic – 2:00pm- 5:30pm

Friday 13th August

Paper II: Drama & Poetry – Literature in English – 10:00am – 11:40am
Paper III & II: Objective & Essay – Insurance – 3:00pm – 5:40pm

Saturday 14th August

Paper III & II: Objective & Essay – Computer Studies – 10:00am – 1:00pm
Paper III & II: Objective & Essay – Christian Religious Studies – 3:00pm – 5:30pm
Paper III & II: Objective & Essay – Islamic Studies – 3:00pm – 5:30pm

Monday 16th August

Paper III: Objective – Further Mathematics – 10:00am – 12:00noon
Paper II: Essay – Further Mathematics – 12:15pm – 2:45pm
Paper III & IV: Objective St Prose – Literature in English – 3:15pm- 5:30pm
Paper IV: Drawing & Design – Woodwork – 3:15pm-5:15pm

Download Timetable In PDF Format

You can also download the 2021 NECO timetable in PDF format by clicking the button below:

DOWNLOAD PDF !

SCHOOLS AND CANDIDATES SHOULD NOTE THE FOLLOWING

WHERE THE TIME ON THE QUESTION Paper DIFFERS FROM THE TIME ON THIS TIMETABLE, THE TIME ON THE QUESTION Paper SHOULD BE STRICTLY ADHERED TO.
FOR PHYSICAL EDUCATION AND AUTO MECHANICS PRACTICAL Paper I; FRENCH, MUSIC AND ARABIC Paper IV, THE SPECIFIC VENUES FOR THE EXAMINATION SHOULD BE CONFIRMED FROM NECO STATE OFFICES.
PRACTICAL IN SCIENCES, STENOGRAPHY, COMPUTER STUDIES & DATA PROCESSING CAN BE IN SETS WHERE THE NUMBER OF CANDIDATES IS LARGE AND THE EQUIPMENT CANNOT GO ROUND.
VISUAL ARTS Paper IV [CREATIVE DESIGN] SHOULD BE GIVEN TO CANDIDATES AT LEAST ONE WEEK BEFORE THE EXAMINATION DATE.
WELDING & FABRICATION, ENGINEERING CRAFT PRACTICE SHOULD BE GIVEN TO CANDIDATES AT LEAST THREE WEEKS BEFORE THE EXAMINATION DATE.
NIGERIAN LANGUAGES (HAUSA, IGBO, YORUBA, EDO, EFIK AND IBIBIO) INCLUDE LITERATURE ASPECT.
ALBINOS AND BLIND CANDIDATES ARE TO BE ALLOWED 30 EXTRA MINUTES AT THE END OF EACH SUBJECT.
BLIND CANDIDATES MUST MAKE USE OF THE NECO SUPPLIED OBR CUSTOMISED BRAILLE SHEET FOR THE EXAMINATION.
DYEING AND BLEACHING IB, PHOTOGRAPH IB, PAINTING AND DECORATION IB, PRINTING CRAFT PRACTICE IB, LEATHER GOODS MANUFACTURING AND REPAIR IB, SHOULD BE GIVEN TO CANDIDATES AT LEAST TWO WEEKS BEFORE THE EXAMINATION DATE.
USE OF A SCIENTIFIC CALCULATOR IS ALLOWED.
BRINGING INTO THE EXAMINATION HALL ELECTRONIC COMMUNICATION GADGETS (PROGRAMMABLE CALCULATORS, MOBILE PHONES, IPADS, TABLETS ETC) IS STRICTLY PROHIBITED.

There are many NECO 2021 candidates. Some of them are your friends. Therefore, you should SHARE this NECO Timetable with them.

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Home » NECO » NECO GCE Chemistry Answers 2021 [Obj & Essay] Released

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Neco gce chemistry answers 2021 [obj & essay] released.

NECO GCE Chemistry Answers 2021 Released.

See neco gce chemistry answers 2021 from this post. The National Examination Council (NECO) Chemistry paper is scheduled to be written on Thursday, 23rd November 2021 from 2:00 pm to 5:00pm.

This Neco gce chemistry exam is for Papers III & II: Objective & Essay and will take a total of 3hrs to write. Here, we will be posting out the neco chemistry questions for candidates that will participate in the examination.

Note that below is the questions from Neco past questions and answers that we feel are likely questions for SSCE preparation.

Neco GCE Chemistry Questions & Answers 2021.

1. (a) State (i) Pauli’s Exclusion principle; (ii) Hund’s rule of maximum multiplicity.

(b) (i) Write the electronic configuration of each of the following ions of copper: I. Cu+; II. Cu2+. [29Cu] (ii) Give the number of unpaired electrons in each of the ions in 1(b) (i) above. (iii) State the type of reaction represented by the following equation: 2Cu+(aq) → Cu2+(aq) + Cu(s) (iv) Write the formula of one compound of Cu+.

(c) (i) Name the type of radiation that will I. penetrate lead block; II. be stopped by thin paper. (ii) Give the charge on each of the radiations mentioned in 1(c) (i) above. (iii) What term is used to describe each of the following nuclear processes? I. Combination of two lighter nuclei to form a heavy nucleus. II. Splitting of a heavy nucleus into two or more lighter nuclei. III. Time required for one-half of the atoms of a radioactive substance to decay.

(d) Arrange the following ions in order of increasing size. Give a reason for your answer in each case. I. Li+, K+ , Na+; II. O2-, F-, N3- (e) Determine the percentage composition of phosphorus and oxygen in phosphorus (V) oxide. [P = 31, O = 16]

2. (a) (i) Define in terms of electron transfer I. oxidizing agent; II. reducing agent. (ii) Write a balanced equation to show that carbon is a reducing agent. (iii) State the change in oxidation number of the specie that reacted with carbon in 2 (a)(ii).

(b) A gas X has a vapour density of 32. It reacts with sodium hydroxide solution to form salt and water only. It decolourizes acidified potassium tetraoxomanganate (VII) solution and reacts with H2S to form sulphur. Using the information provided: I. identify gas X; II. state two properties exhibited by X; III. give two uses of X.

(c) Consider the following substances: (i) sodium; (ii) lead (II) iodide; (iii) hydrogen; (iv) magnesium; (v) oxygen. Which of the substances (i) conducts electricity? (ii) is produced at the cathode during electrolysis of H2SO4(aq)? (iii) corresponds to the molecular formula AB2 ? (iv) is an alkaline earth metal?

(d) (i) Define the term salt. (ii) Mention two types of salt. (iii) Give an example of each of the salts mentioned in 2(d)(ii) above.

(e) In a neutralization reaction, dilute tetraoxosulphate (VI) acid completely reacted with sodium hydroxide solution. (i) Write a balanced equation for the reaction. (ii) How many moles of sodium hydroxide would be required for the complete neutralization of 0.50 moles of tetraoxosulphate (VI) acid?

3. (a) Consider the following reaction sequence. (i) What process leads to the formation of K? (ii) Write the formula of K. (iii) Write the structural formula of L and name L. (iv) Name An. (v) Write the structure of M and name M.

(b) (i) What are carbohydrates? (ii) Give one example each of a; I. monosaccharide; II. disaccharide; III. polysaccharide. (c) A hydrocarbon Z with molecular mass 78 on combustion gave 3.385 g of CO2 and 0.692 g of H2O. Determine the molecular formula of Z. [H = 1, C=12, O=16]

4. (a) (i) Define covalent bond. (ii) Give two properties of covalent compounds (iii) With the aid of a diagram, show how ammonia molecule is formed. (iv) Illustrate with a diagram the formation of ammonium ion. (v) What type of bond(s) exist(s) in ammonia, ammonium ion? [ 1H, 7 N] (b) (i) Write three subatomic particles with their corresponding relative masses. (ii) Name the possible states in which water can exist. (c) (i) State Graham’s law of diffusion. (ii) Arrange the following gases, He, CH4 and N2 in order of increasing rates of diffusion. Give a reason for the order. [H=1, He=4, C=12, N=14 ]

(d) Draw the structures of the following compounds: (i) 2, 3-dimethylbutane; (ii) 1, 4-dibromocyclohexane.

5. a) Write a balanced chemical equation for the reaction of butane gas with oxygen gas to form carbon dioxide and water vapor. b) How many liters of oxygen are required to produce 2.0 liters of CO2? c) How many liters of CO2 are produced from 11.6 g of butane at STP? d) How many molecules of water vapor are produced from 5.6 liters of butane gas at STP?

6. (a) (i) What are acidic oxides? (ii) Give one example of each of the following oxides: I. acidic oxide; II. basic oxide; (III) amphoteric oxide; (III) neutral oxide.

(b) (i) Define each of the following terms: I. Heat of combustion; II. Heat of neutralization. (ii) Write an equation to illustrate each of the terms in 6(b)(i) above. (iii) Given that the standard heat of combustion of butane (C4H10) is + 5877 kJmol-1, calculate the heat of combustion of 14.5 g butane. [H = 1, C = 12] (c) (i) Name two allotropes of sulphur. (ii) State one difference between the two allotropes. (d) (i) Give two characteristics of noble gases. (ii) State one use each of (I) He; (II) Ar. (e) State what is observed on warming ammonium trioxonitrate (V) with sodiumhydroxide.

7. (a) (i) Define hard water. (ii) Name two substances responsible for hardness in water. (iii) Give two methods for the removal of hardness in water. (b) (i) What are the raw materials required for the manufacture of tetraoxosulphate (VI) acid by the contact process? (ii) Write an equation for the reaction that requires a catalyst in the contact process. (iii) State the catalyst used in 7(b)(ii). (c) (i) Give two uses of sodium tetraoxosulphate (VI) Consider the reaction represented by the following equation: exposure to air Na2SO4 (aq) IOH2O (s) → Na2SO4 H2O + 9H2O (g) (ii) What name is given to this type of reaction? (iii) Calculate the solubility of Na2CO3 at 25oC, if 30.0cm3 of its saturated solution at that temperature gave 1.80 g of the anhydrous salt. [C=12, O=16, Na=23]

(d) (i) Define the term activated complex. (ii) State one reason why a collision may not produce a chemical reaction. (iii) The formation of water gas is represented by the following equation. C(s) + H2 O(g) → CO (g) H2 (g) ΔH = + 131 kJmol-1

(e) Draw an energy profile diagram for the reaction showing the I. activated complex II. enthalpy of reactants.

8. (a) (i) How many liters of methane are there in 8.00 grams at STP? (ii) Calculate the density of carbon dioxide at 546 K and 4.00 atmospheres pressure. (iii) What volume of O2 at 710. mm Hg pressure and 36°C is required to react with 6.52 g of CuS? CuS(s) + 2 O2(g) ® CuSO4(s)

(b) (i) What is the molar mass of a gas if 7.00 grams occupy 6.20 liters at 29°C and 760. mm Hg pressure? (ii) At a particular temperature and pressure, 15.0 g of CO2 occupy 7.16 liters. What is the volume of 12.0 g of CH4 at the same temperature and pressure?

(c) To prepare a sample of hydrogen gas, a student reacts 7.78 grams of zinc with acid: Zn(s) + 2 H+ (aq) ® Zn2+(aq) + H2(g) The hydrogen is collected over water at 22°C and the total pressure of gas collected is 750. mm Hg. What is the partial pressure of H2? What volume of wet hydrogen gas is collected?

NOTE: That there is nothing like Neco expo chemistry online. Do not be deceived by fraudsters posing with fake NECO answers on the internet.

NECO GCE Chemistry Objectives.

Focus Areas – Gases:

Kinetic-molecular theory
barometer, manometer
temperature
absolute zero temperature
relationship between pressure, volume, temperature
Boyle’s Law
Charles’ Law
Ideal Gas Law R = 0.08206 L atm/mol K
molar volume
molar volume @ STP = 22.4 L
molar mass and density of a gas
gas stoichiometry
partial pressure.

The details of the NECO Chemistry SSCE question will be made available to you candidates as soon as it is released. Keep following this page.

If you have any questions, endeavour to use the comment box below…

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Good evening every one please i need 2022 chemistry objectives past Questions and answers With the theory please help us.

Please can I get the internal NECO past questions and answers and possibly also this ones I.e this year’s 🔝 answer.

I’d also be very grateful if I can get the analysis of the most frequently asked questions in NECO for both objectives and essays.

Good, but I need the internal past questions and answers 2019 chemistry

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2021 NECO CHEMISTRY OBJ AND THEORY QUESTIONS AND ANSWERS

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2021 NECO CHEMISTRY OBJ AND THEORY QUESTIONS AND ANSWERS

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What Neco Sets In English And Hot Topics

Modified On Jan 20, 2021

What are the areas Neco will set English questions from and how do I get NECO English 2021 OBJ and theory questions answered correctly in the exam? Neco 2021 Questions and how you can answer them correctly to get A1 is the topic we shall discuss here today.

NECO ENGLISH QUESTIONS is general for every Neco 2021 Candidate sitting or writing English . Whether you are an Art, science or commercial student, you must offer and answer questions from Neco English Language.

Continue reading for Topics/Questions Neco will set in 2021 English Language or quickly click here to go through Neco 2021 syllabus and hot topics to read.

Likely Neco 2021 Questions And Answers

English Language - Meaning, Units & Skills

Emphatic Stress | Detailed Explanations & Questions

You have asked the questions, what are the areas Neco sets questions in English Language? I am here to give you the bold answers to your question.

To make this topic easy for you to understand, I will divide it into four sections. The three sections are:

NECO 2021 English Objective Test Questions

Neco Test Of Oral English Questions

Neco 2021 Theory Questions And How To Answer them.
Instructions To Pass Neco 2021 Examination.

Under number 3, we shall discuss:

Neco English Essay Writing Questions
Neco English Language Comprehension Questions
Summary Questions For Neco.

Now that you are familiar with the various areas Neco 2021 questions will come from, the next thing is to know exactly what Neco will ask from these areas in 2021 Neco English Language.

NECO 2021 English Objective Test Questions:

As usual, you will be given questions and options A to D to choose from. Normally, the number of objective questions you are to answer in Neco 2021 English Language is 80 to 100 questions.

The areas you will be tested in English Language OBJ are:

A. Words And Opposite (antonyms): E.g Halima likes to dwell on trivial , rather than ___ matters.

A. Strong B. Popular C. Weighty D. Heavy

The answer is simply C. The opposite of trivial is weighty. You need to practice as many synonyms and antonyms as possible.

The good news is that you don’t need to know all the synonyms and antonyms in the dictionary, you can use common sense to answer questions well.

B. Nearest in Meaningh (synonyms): In this part, you will be asked questions and to look for words or group of words nearest in meaning.

E.g: Everyone has the urge to succeed in life. Find the word nearest in meaning to the underlined word.

A. Compulsion B. Desire C. Need D. Courage

Of course, the answer is desire. Simple right?

C. Complete Sentence : You will be given a sentence and asked to choose the word that best completes each of the following sentences.

E.g: We can ___ signal from one point to another.

A. Transmit B. Transmission C. Transmission Transmission D. I mean transmission

D. Fill In The Gap Neco Questions: You shall be given questions with gaps and asked to find sentences that best completes the gap. Here, you are not filling the gap with a simple word but a prase or clause.

E.g: If Isaac had woken up earlier, he ___ breakfast.

A. Would not have missed B. Ought not to miss C. Shall have missed D. May have missed

In simple sentence, Isaac woke up late and he missed the breakfast. The correct answer is A.

E. Lexis structure and interpretations : You must also get questions from lexis and structure and interpretation. The good news is that if you understand A to D Objective questions for Neco above, you shall be good to go.

Read Also: How to answer Neco questions very fast

Under Neco 2021 Oral English session, you will be tested on Vowel sounds, Consonants sounds, rhymes, sound and stress pattern. Examples of questions that come out in Neco oral English are:

A. Same vowel Sound: E.g, C oi n A. toy B. rod C. lord D. ride

B. Same consonant Sound: E.g, vi ce A. cat B. dress C. show D. chalk

C. Emphatic stress: E.g, AYO asked Mary to come today. A. Did Chike ask Mary to come today? B. Did Ayo order Mary to come today? C. Did Ayo ask Dad to come today? D. Did Ayo ask Mary to come tomorrow?

Neco Theory Questions And How To Answer

The following are tested in this section. I have already treated how to answer Neco 2021 English comprehension passages. You should click here now to read how to answer comprehension passage very fast plus examples of passages that Neco would set for 2021 Neco English language.

ESSAY WRITING: Under essay, you will be asked to answer only one of the following…

Letter writing: Write a letter to…
Write an article
Write a speech or debate
Write a story to illlustrate the saying:

Neco English Language Summary Questions

You will be given a passage and asked to summarize everything in the passage. You would also be asked to say what the writer inteded. This part is very easy. You may click here to start answering Neco questions online .

That’s all for now… I shall update you when more real live questions and answers come up. However, I advise that you are hardworking so as to pass your Neco once and for all.

Read Also: How to read and pass Neco in one day

Feel free to share this article with friends using the share buttons and don’t fail to comment using the comment box below.

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FlashLearners CEO, Students Advocate , SEO Expert And YouTuber

62 Comments

Ra'ahma bint yunus says

It’s so helpful, more ink 2 your pen and more grace to your elbow

Anonymous says

Is this the real neco exam

The real neco questions please…

Iwu Mary says

Wow… nice one I pray for success in my exams

Kwaku Ibrahim says

Monye Elizabeth says

Pls I need an advice on reading,to be frank I don’t know how to read for long and understand wat have read

i need maths answer please

jingas says

hy when neco will come out

Ediomo Edet Etim says

Mathematics ss2 promotion exam

I need ur help..

olayem says

are they re writing this English again

usman magaji zango says

is it true today are English neco writing.

anwer for english test of orals pls

I need English language answer please

I need English answer

SS 2 ENGLISH LANGUAGE ANSWERS

Joseph Agwuchi says

pls i need yor help

olawshina says

plz I need ur English questions plz 4 Christ sake

Peter Jesse says

Please help

husaini ahmed says

Poshmontana says

Pls may God bless you and your family, I need answers pls

Have the exams started over here in rivers state exam hasn’t satrt to 12

I need letter writing

SORE GASKE says

I WISH U ALL D BST

Ikemefuna isioma says

Yes I need d NECO English answer

miracle johnpaul okoli says

I need English also pls

tochukwu says

I need neco question answer English

chemistry essay and objective neco 2021

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EXAMCLASS.NET BEST WEBSITE FOR JAMB RUNZ,WAEC RUNZ, NECO RUNZ,SCHOOL NEWS, UPDATES

2021 NECO CHEMISTRY OBJ AND THEORY QUESTIONS AND ANSWERS

Be the first to comment

What Neco Sets In English And Hot Topics

Likely Neco 2021 Questions And Answers

English Language - Meaning, Units & Skills

Emphatic Stress | Detailed Explanations & Questions

Neco Test Of Oral English Questions

NECO 2021 English Objective Test Questions:

Neco Theory Questions And How To Answer

Neco English Language Summary Questions

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