WAEC Past Questions And Answers On Chemistry 2022: Get The Complete WAEC Past Questions And Answers On Chemistry Here

WAEC Past Questions And Answers On Chemistry 2022

The WAEC exams are going on, and the WAEC Chemistry 2022 exam is expected to be conducted on three days with the practical exams and the theory. This has stoked the curiosity of students who have begun looking for WAEC Past Questions And Answers On Chemistry, significantly since WAEC Past Questions And Answers On Chemistry help the students better prepare for the exam. The keen interest taken by the students towards the WAEC Past Questions And Answers On Chemistry has resulted in them searching for the WAEC Past Questions And Answers On Chemistry. We have assimilated the list of WAEC WAEC Past Questions And Answers On Chemistry here in the section below for students who are interested in the same.

Objective WAEC Past Questions And Answers On Chemistry 2022

WAEC Chemistry past questions and answers PDF, particularly the Objective WAEC Past Questions And Answers On chemistry, has been highly sought after, especially since the exam is approaching soon and with the Objective WAEC Past Questions And Answers On Chemistry, comprehending the subject would become a lot easier. We have the past WAEC Past Questions And Answers On Chemistry. And we have managed to get an idea of how the WAEC Chemistry Questions and Answers 2022 would be framed. Here are some objective WAEC WAEC Past Questions And Answers On Chemistry.

1. Elements that belong to the same group in the Periodic Table are characterized by

A. difference of +1 in the oxidation numbers of successive members

B. presence of the same number of outermost electrons in the respective atoms

C. difference of 14 atomic mass units between successive members

D. presence of the same number of electron shells in the respective atoms

2. The atom of an element X combines with aluminum (13AI)?

A. AIX 2

B. AI 2X

C. AI2X 2

D. AI 2X 3

3. The presence of unpaired electrons in an atom of a transition metal gives rise to

A. paramagnetism

B. malleability

C. ductility

D. shiny appearance

4. What is responsible for metallic bonding?

A. Sharing of electrons between the metal atoms

B. Attraction between the atomic nuclei and cloud of electrons

C. transfer of electrons from one atom to another

D. Attraction between positive and negative ions

5. Which of the following compounds is covalent?

A. CaCI2

B. MgO

C. NaN

D. CH4

6. A sheet of paper is placed in the path of a beam from a radioactive source. The emissions that pass through the paper consist of

A. alpha particles and gamma rays

B. alpha and beta particles

C. beta particles and gamma rays

D. alpha particles only

7. Which of the following features of a human skeleton can be determined by carbon dating?

A. Height

B. Mass

C. Age

D. Race

8. Which of the following statements about ideal gases is/are correct? 1. The cohesive forces between their particles are negligible ll. They have no definite volume but occupy the volume of their containers. III. They are not compressible IV. Their particles collide with a loss of energy

A. l only

B. l and ll only

C. l, ll, and lll only

D. l, ll, lll, and IV

9. P Total = F1 + P2 + P 3 + .........Pn' where P Total is the pressure of a mixture of gasses. The equation above is an expression of

A. Graham's law

B. Gay-Lussac's Law

C. Boyle's law

D. Dalton's law

10. Which of the following pairs of reagents react to produce hydrogen?

A. Zinc and concentrated trioxonitrate (V) acid

B. Water and calcium dicarbide

C. Copper and dilute hydrochloric acid

D. Magnesium and dilute tetraoxosulphate (VI) acid

11. A mixture of calcium chloride and calcium trioxocarbonate (IV) in water can be separated by

A. evaporation

B. sublimation

C. distillation

D. filtration

12. Which of the following would dissolve in warm dilute H2SO4 without effervescence, to give a blue solution?

A. Copper turnings

B. Copper (ll) trioxocarbonate (IV)

C. Copper (ll) oxide

D. Copper alloy

13. Which of the reactions represented by the following equations is HNO3 behaving as a typical acid?

A. CaO + 2HNO3 → Ca(NO3) 2 + H 2O

B. Cu + 4HNO3 → Cu(NO 3)2 + 2H2O + 2NO2

C. S + 6HNO3 → H2SO 4 + 6NO2 + 2H2O

D. P + 5HNO3 → H 3PO 4 + 5NO2 + H2O

14. The gas evolved when a sample of gastric juice reacted with sodium trioxocarbonate (IV) . The gas evolved was

A. NH3

B. SO2

C. HCl

D. CO2

15. It can be concluded that gastric juice

A. contains enzymes

B. is acidic

C. is a mixture

D. has a pH value of 7

16. What does ∆H represent in the following equation? Cl(g) + e- → CI- (g); ∆H = - 363 kJ mol-1

A. ionization energy

B. Electron affinity

C. Dissociation energy

D. Heat of atomization

17. Consider the following equation: Ag+ (aq) + CI-(aq) → Ag+CI- (s) ; ∆H = _65.7 kJmol-1. From the equation, it can be deduced that.

A. direct combination is involved, and the reaction is endothermic

B. a solid is formed, and heat is evolved

C. activation energy is high, and a catalyst is required

D. the reaction is endothermic and occurs at high temperature

18. A reaction is represented by the equation below. A2(g) + B2(g) 2AB(g); ∆H = +X kJmol-1 Which of the following statements about the system is correct?

A. The reaction goes to completion at equilibrium

B. The forward reaction is exothermic

C. At equilibrium increase in temperature favors the reverse reaction

D. Pressure does not affect the equilibrium mixture

19. What is the oxidation number of nitrogen in AI(NO3)3?

A. + 1

B. + 3

C. + 5

D. + 6

20. What is oxidized in the reaction represented by the following equation? 3CU + 8HNO3 → 3Cu(NO3)2 + 2NO + 4H2O

A. Oxygen

B. Hydrogen

C. Nitrogen

D. Copper

Answer:

1. B

2. D

3. A

4. B

5. D

6. C

7. C

8. B

9. D

10. D

11. D

12. D

13. A

14. D

15. B

16. B

17. B

18. D

19. C

20. D

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