Waec Chemistry 1988 Past Questions and Answers

Question 41:

• WAEC 1988

50cm\(^{3}\) of sulphur (IV) oxide were produced at s.t.p. when some quantity of powdered sulphur were burnt in excess oxygen
(a) Write the equation for the reaction
(b) Calculate the volume of oxygen used up during the reaction
(c) Which of the gas laws is applicable? State the law.

Question 42:

• WAEC 1988

(a) How does the collision theory explain the rate of a chemical reaction?
(b) State how each of the following affects the rates of chemical reactions:
(i) surface area (ii) catalyst

Question 43:

• WAEC 1988

(a) Write the ionic equation for the reaction between zinc powder and silver trioxonitrate (VI) solution
(b) Which substance in (a) above is (i) oxidized, (ii) reduced?
(c) State two applications of oxidation numbers

Question 44:

• WAEC 1988

(a) What is a carbohydrate?
(b) Name two types of carbohydrates and give one example of each type

Question 45:

• WAEC 1988

(a) Name the major raw materials used in the manufacture of the following:
(i) polythene
(ii) margarine
(iii) cement
(b) State one problem associated with oil producing areas