Waec Chemistry 1988 Past Questions and Answers

Question 36:

• WAEC 1988

The reaction represented by the equation C_(s) + H₂O_(l) → CO_(s) + H _2(s) was carried out at 27_oC if the enthalpy change was + 4500 J and the entropy change was + 12J, what was the free energy change? (∆G = ∆H - T∆S)

A. - 4176 J
B. +4176 J
C. - 900 J
D. + 900 J
E. +8100 J

Question 37:

• WAEC 1988

During the electrolysis of dilute tetraoxosulphate (VI) acid solution 0.05 mole of electrons were passed what volume of gas was produced at the anode? (Gaseous molar volume = 22. 4dm³ at s.t.p)

A. 0.224 dm³
B. 0.280 dm³
C. 0.560 dm³
D. 2.24 dm³
E. 22.4 dm³

Question 38:

• WAEC 1988

(a) Name two allotropes of carbon
(b) Name two products of the destructive distillation of coal and state one use of each.

Question 39:

• WAEC 1988

(a) Give one example of;
(i) heavy chemicals
(ii) fine chemicals
(b) Write the structural formulae and the names of compounds having the formula CH\(_4\)CI,

Question 40:

• WAEC 1988

(a) Arrange the following in their correct order of increasing energy: alpha particles, gamma rays and beta particles
(b) State one difference between nuclear fission and nuclear fusion