Jamb Chemistry Exam Questions and Answers for free for all Jamb candidates are now available. The Jamb Chemistry exam questions are now trending online, you can use them for guidelines to study.

Jamb exam questions are logical in the sense that all the answers option look alike or exactly which made it so confusing and make many candidates fail.

Jamb Chemistry exam questions are not hard or difficult, you can use a sample of our Jamb Chemistry exam questions and answers available here for guides.

If you have not still covered the 2023 Jamb Chemistry syllabus kindly do because Jamb we set questions from the syllabus. You only need to read using the JAMB Chemistry syllabus as a guide to know the JAMB topics to cover before the Jamb exam day.

Jamb Chemistry Exam Questions and Answers For All Jamb Candidates

1. 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 temperature, 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

Correct Answer: B

2. Zinc Oxide is a

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

Correct Answer: C

3. 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

Correct Answer: D

4. 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

Correct Answer: D

5. 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. 50cm3
C. 20cm3
D. 25cm3

Correct Answer: B

6. A 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

Correct Answer: B

7. 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

Correct Answer: D

8. 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

Correct Answer: A

9. The oxidation state of chlorine in potassium chlorate is

A. +1
B. +2
C. +3
D. +5

Correct Answer: D

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 carbon dioxide
B. the rare gases
C. nitrogen and oxygen
D. nitrogen and the rare gases

Correct Answer: D

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

A. thermodynamic
B. exothermic
C. isothermal
D. endothermic

Correct Answer: D

12. 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

Correct Answer: C

13. 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

Correct Answer: D

14. 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

Correct Answer: C

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

A. Sodium
B. Copper
C. Iron
D. Calcium

Correct Answer: B

16. 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

Correct Answer: D

17. 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

Correct Answer: D

18. 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

Correct Answer: C

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

A. acetic acid and ethene
B. ethanoic acid and ethene
C. methanoic acid and ethylene
D. ethanol and ethene

Correct Answer: A

20. 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

Correct Answer: C

21. Brass and bronze are both metallic alloys. Which of the following constituents is common to both alloys?

A. Tin
B. Zinc
C. Copper
D. Lead

Correct Answer: C

22. Which of the following gases may not be dried with concentrated sulphuric acid?

A. HCl
B. NH3
C. Cl2
D. SO2

Correct Answer: B

23. Which of the following reactions does not take place in the smelting of iron in a blast furnace?

A. CaCO3(s) CaO(s) + CO2(g)
B. C(s) + O2(g) CO2(g)
C. 3FeCO(s) + 2OCO2(g) FeO4(s)
D. SiO2(s) + CaO(s) CaCO3(s)

Correct Answer: C

24. Which of the following is not a member of the homologous series of the paraffins (alkanes)?

A. C24H48
B. C5H12
C. C7H16
D. C15H32

Correct Answer: A

25.When ammonia and hydrogen ion bond together to form ammonium ion, the bond formed is called

A. ionic bond
B. electrovalent bond
C. covalent bond
D. co-ordinate bond

Correct Answer: D

26. A second alkanol can be oxidized to give an

A alkanone
B alkyne
C alkanoic acid
D alkanal

Correct Answer: A

27 Which of the following will give a precipitate with an aqueous solution of copper (I) chloride?

A But-2-ene
B But-1-ene
C But-2-yne
D But-1-yne

Correct Answer: D

28 The IUPAC name for CH3CH2COOCH2CH3 is

A methylpropanoate
B ethylethanoate
C ethylpropanoate
D methylethanoate

Correct Answer: C

29 A certain hydrocarbon on complete combustion at s.t.p produced 89.6dm3 of CO2 and 54g of water. The hydrocarbon should be

A C6H6
B C4H10
C C5H10
D C4H6

Correct Answer: D

30 2-methylprop-1-ene is an isomer of

A 3-methyl but-1-ene
B 2-methyl but-1-ene
C but-2-ene
D pent-2-ene

Correct Answer: D

31 An example of an alcohol is

A. CCl4
C. CHCl3

Correct Answer: D

32 The IUPAC name of the compound CF3 CHBrCl is

A 2-chloro-2-bromo-1,1,1-trifluoroethane
B 2-bromo-2-chloro-1,1,1-trifluoroethane
C 1-bromo-1-chloro-2,2,2-trifluoroethane
D 1,1,1-trifluoro-2-bromo-2-chloroethane

Correct Answer: B

33 Synthetic rubber is obtained from the polymerization of

A neoprene
B isoprene
C butandiene
D propylene

Correct Answer: B

34. Burning magnesium ribbon in air removes which of the following
(i) oxygen
(ii) nitrogen
(iii) argon and
(iv) carbon(iv)oxide?

A i and iv only
B i, ii, iii and iv only
C i only
D i and ii only

Correct Answer: C

35. Which of the following is the best starting material for the preparation of oxygen? Heating of trioxonitrate (v) with

A Pb
B Zn
C Ca
D Na

Correct Answer: A

36. The nucleus of an atom contains

A. protons only
B. neurons only
C. protons and Neutron
D. neutrons and electrons
E. protons and neutrons

Correct Answer: c

37. Hypochlorous acid is used as a bleach because

A. it is a strong acid
B. it yields chlorine readily in pure water
C. it is an oxidising agent
D. it is a weak acid

Correct Answer: C

38.The normal boiling point of a liquid is defined as

A. the temperature at which its vapour pressure equals the atmospheric pressure
B. the temperature at which bubbles begin to form
C. the temperature at which the vapour pressure equals 1 temperature
D. the temperature at which the rate of condensation of vapour equals the rate of vaporisation of the liquid

Correct Answer: C

39. Which of the following compounds will form a solution if exposed to air?


Correct Answer: D

40. The most common type of chemical reaction that alkanes undergo is

A. substitution
B. addition
C. condensation
D. polymerisation

Correct Answer: A

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