NECO Chemistry Questions And Answers 2020/2021

Correct NECO Chemistry Answers 2020: Get free Expo Hints For NECO Chemistry Theory & OBJ Questions and Answers and Free Expo Hints for Paper 1 and paper 2 (Essay and Objective).

This is a simple hint for the NECO Chemistry Question And Answers 2020 that will help you. This post covers all  the NECO Chemistry Exam Question And Answers 2020 expos that you need to know.

NECO Chemistry Theory & OBJ Questions and Answers and Free Expo Hints for Paper 1 and paper 2 (Essay and Objective).

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2020 NECO Chemistry Exam Scheme and Format

The NECO Obj Questions are similar to that of WAEC. So you don’t have to panic. Like every other exam, the Obj will contain 50 or fewer Multiple choice questions.

The theory part of the exam is still the same. In the theory section, you will be given % or more Questions which you will be required to answer any three.

So, The 2020 NECO Chemistry Exam will follow the below format:

PAPER 1: Will consist of forty multiple-choice objective questions all of which should be answered within 40 minutes for 40 marks.

PAPER 2: Will consist of six essay questions. Candidates will be required to answer four questions within 2 hours for 80 marks.

How To Answer NECO Chemistry Objective Questions [OBJ Section A]

NECO Chemistry section A contains Objective Questions of 4 or 5 different options. In this case, how do you choose a correct Answer form these 4 or 5 options?

To the correct Answer form those different options, follow the steps below:

  • 1. Read a particular question more than once before trying to choose an answer.
  • 2. Answer the questions you know first.
  • 3. Imagine and try recalling what the correct answer is.
  • 5. Eliminate each clearly wrong option that you know that is odd.
  • 6. Using the process of elimination, cross out all the answers you know are incorrect, then focus on the remaining answers. Not only does this strategy save time, it greatly increases your likelihood of selecting the correct answer.
  • 7. When two answers are correct in a multiple choice question with an “All of the above” option, then it’s probably the correct choice.
  • 8. If all else tactics fail, then guess like a street magician and you may get it right.

How to Answer NECO Chemistry Theory Questions [Section B].

NECO Chemistry Theory Questions are not the same as the Objective Questions. NECO theory exam questions can sometimes be intimidating especially when you have no self-confidence.

The first thing you have to do when you are about to answer NECO theory Questions is to eliminate fear and believe that you can make it.

NECO Chemistry theory Questions always come in different forms and formats and each format needs a unique and correct answer.

To Answer any NECO Chemistry theory question, follow these steps:

  1. Go through the exam’s instructions first before you start answering its questions.
  2. Read a particular question twice or thrice before you give and answer
  3. Understand each question and what the examiner is really looking for.
  4. Start your answer by echoing the question if it is an essay question.
  5. Go through your Answers to make sure all your writings and answers are well spelled and accurately presented.

NECO Chemistry Theory Answers 2020 format

When answering theories or Essay questions, take note of the following and how you should present your answers:

  • Describe: This means you should say what you see – no need for reasons. You can give a detailed account, using examples
  • State: Provide a factual report with no explanation or opinion.
  • List: Write down bullet points, not paragraphs. Keep it brief.
  • Explain: give reasons
  • Outline: give a brief summary
  • Analyse: go into detail
  • Compare: what are the similarities and differences?
  • Contrast: what are the differences?
  • Calculate: use numbers given to work out the value of something
  • Define: give the meaning of something
  • Evaluate: consider both sides – pros and cons
  • Justify: give evidence to explain something
  • To what extent: Judge the importance or success of something – has it worked or not
  • Argue: present a case with evidence or reasons
  • Assess: Weigh up / give an informed judgement
  • Comment on: give your opinion on something
  • Debate: give different perspective

Free NECO Chemistry Past Questions And Answers 2020.

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 proportions

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

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]

  • A) They are both gases
  • B) Their molecules contain carbon
  • C) They have the same relative molecular mass
  • D) Both are denser than air

10. 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

  1. boiling the water
  2. adding excess calcium hydroxide
  3. adding a calculated amount of calcium hydroxide
  4. adding sodium carbonate
  5. adding magnesium hydroxide

12. During the electrolysis of copper II sulphate between platinum electrodes, if litmus solution is added to the anode compartment,

  1. the litmus turns blue but no gas is evolved
  2. the litmus turns blue and oxygen is evolved
  3. the litmus turns blue and hydrogen is evolved
  4. the litmus turns red and oxygen is evolved
  5. 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;

  1. saponification
  2. dehydration
  3. esterification
  4. hydrolysis
  5. hydration

14. The IUPAC names of the compounds CH3COOH and CH2=CH2 are respectively;

  1. acetic acid and ethane
  2. ethanoic acid and ethene
  3. methanoic acid and ethylene
  4. ethanol and ethene
  5. 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?

  1. 9.3 sec
  2. 14 sec
  3. 21 sec
  4. 28 sec
  5. 30.3 sec

16. When heat is absorbed during a chemical reaction, the reaction is said to be

  1. thermodynamic
  2. exothermic
  3. isothermal
  4. endothermic
  5. 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

  1. disintegration
  2. polymerization
  3. cracking
  4. degradation
  5. distillation

18. The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore

  1. none of these solutions is acidic
  2. the pH of Y is made more acidic by the addition of distilled water
  3. Z is the most acidic solution
  4. W is the most acidic solution
  5. X is neutral

19. When each of the nitrates of Potassium, Magnesium, and iron is heated,

  1. all the nitrates decompose to their oxides
  2. the nitrate of magnesium gives the nitrite and oxygen
  3. the nitrates of iron magnesium and iron give the oxides
  4. the nitrate of iron gives the nitrite and oxygen
  5. the nitrate of the magnesium is not decomposed

20. Which of the following metals cannot replace hydrogen from water or steam?

  1. Sodium
  2. Magnesium
  3. Iron
  4. Calcium
  5. Copper

NECO Chemistry Questions And Answers 2020 format (paper 2)

Don’t worry about NECO Chemistry theory Questions 2020. All you need to do is to keep on refreshing this page for the NECO Chemistry Theory answers 2020 theory of this year. We may post it here anytime we have it.

In alkanes (saturated hydrocarbons) each carbon atom forms

  1. 2 bonds
  2. 4 bonds
  3. 6 bonds
  4. 8 bonds

Raffinose is an example of

  1. monosaccharides
  2. disaccharides
  3. polysaccharides
  4. Trisaccharides

From Bronsted-Lowery theory, we see an acid as a?

  1. proton acceptor
  2. electron acceptor
  3. proton donor
  4. electron donor

What happens to a blue litmus paper when dipped in an acid?

  1. remains unchanged
  2. turns pink
  3. it turns red
  4. becomes colorless

The first step of raw water treatment is____?

  1. sedimentation
  2. coagulation
  3. filtration
  4. chlorination

Area Of Concentration For NECO 2020 Chemistry Exam

Below are the step-by-step guides on how to prepare for the NECO Chemistry 2020 Exam and solve all the Chemistry Exam’s problems by yourself.

Proper Preparation: All you need to do is to sit down to study your Chemistry. You can Study your Chemistry properly using the No.2 below.

Use Good Chemistry Textbooks: All that you are looking for is in your textbook. There is nothing good as sound textbooks. The textbooks are your companion.

Make good use of Chemistry textbooks in addition to your class note and you will see yourself solving complex Chemistry questions.

One textbook is not enough, some textbooks make harder topics simpler to understand than the others. You are advised to make textbooks your companion.

Most of the questions you will see in these exams are repeated questions of past years NECO exams. Even if the questions happen not to be a repeated question, I am 100% sure it must have the same format as the past questions. Using past questions will give you insight into how the exam will look like.

Being able to answer past questions correctly actually means you can also give/get this NECO Chemistry Questions And Answers 2020 correctly by yourself without Expo or cheating.

Final hint:

Now that you have gotten this NECO Chemistry Questions And Answers 2020, the decision is now yours to choose how you want to utilize it.

The best way to always pass any exam is not to depend on expos, but to do your proper studies. Try your best, follow our instructions, and expect the best out of these exams.

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