Raising the temperature increases the rate of a reaction mainly because:

more molecules have energy above the activation energy

the activation energy is lowered

For an exothermic reaction at equilibrium, raising the temperature will:

shift the equilibrium to the left

shift the equilibrium to the right

West African Examinations Council

WASSCE Chemistry · Paper 1 — Objective

Multiple-choice. This is the paper the CBT simulator practises.

38 exam-style questions, written to the West African Examinations Council format and free to read. The answers are here too — what they do not tell you is how many you would get right with a clock running.

Sit this paper timed All WASSCE Chemistry papers

1. During the electrolysis of dilute sodium chloride solution, the gas evolved at the cathode is:

WASSCE Chemistry · Paper 1 — Objective

1. During the electrolysis of dilute sodium chloride solution, the gas evolved at the cathode is:

2. Raising the temperature increases the rate of a reaction mainly because:

3. How many moles are there in 44 g of carbon dioxide? (C = 12, O = 16)

4. The reaction of an alcohol with a carboxylic acid produces an ester and:

5. At constant temperature, the volume of a fixed mass of gas is inversely proportional to its pressure. This is:

6. The oxidation number of manganese in the permanganate ion, MnO4 minus, is:

7. The general formula of alkanes is

8. How many molecules are in 2 moles of a gas? (Avogadro constant = 6.02 × 10²³)

9. Which gas turns limewater milky?

10. The rusting of iron requires the presence of:

11. The bond formed between sodium and chlorine in common salt is:

12. Which method best separates a mixture of ethanol and water?

13. Which reagent distinguishes an alkene from an alkane?

14. For an exothermic reaction at equilibrium, raising the temperature will:

15. What volume does 0.5 mole of a gas occupy at s.t.p.? (Molar volume = 22.4 dm3)

16. Temporary hardness in water is caused by dissolved:

17. The number of molecules in 2 moles of water is (Avogadro constant = 6.02 x 10^23):

18. How many neutrons are in an atom of ¹⁴N (atomic number 7)?

19. Isotopes of an element differ in the number of

20. The number of neutrons in an atom of sodium (mass number 23, atomic number 11) is:

21. Which oxide is amphoteric?

22. Which type of salt is formed by the incomplete neutralisation of a dibasic acid?

23. Across a period from left to right, atomic radius generally:

24. The joining of many alkene molecules into a long chain is called:

25. The bond formed when electrons are transferred from a metal to a non-metal is

26. Which of these is a normal salt?

27. A solution of pH 3 is:

28. Faraday first law of electrolysis states that the mass discharged is proportional to the:

29. A reaction that absorbs heat from its surroundings is described as:

30. Which species contains a co-ordinate (dative) bond?

31. In a redox reaction, the oxidising agent is the species that:

32. The chief ore from which aluminium is extracted is:

33. The general formula of the alkanes is:

34. The electron configuration of an element with atomic number 17 is:

35. What is the mass of 0.5 mole of CaCO₃? (Ca = 40, C = 12, O = 16)

36. Elements in the same group of the periodic table have the same number of:

37. A solution of pH 3 is best described as

38. Isotopes of an element differ in the number of:

Reading these is not the same as sitting them.