Jamb Chemistry 1998 Past Questions and Answers

Question 21:

• JAMB 1998

2Cl^2(g) + 2H₂O_(g) 4HCl_(g) + O_2(g)
∆H° = +115KJ mol^-1. In the above equilibrium reaction, a decrease in temperature will?

A. Favour the reverse reaction
B. Favour the forward reaction
C. Have no effect on the equilibrium state
D. Double the rate of the reverse raection

Question 22:

• JAMB 1998

2X_(g) + Y_(g) → Z_(g): In the equation above, The rate of formation of Z is found to be independent of the concentration of Y and to quadruple when the concentration of X is doubled. The correct equation for the reaction is?

A. R = k (X)(Y)
B. R = K (X) ° (Y)
C. R = K (X) ° (Y) ₂
D. R = K (X) ₂(Y)°

Question 23:

• JAMB 1998

A gas that turns a filter paper previously soaked in lead ethanoate solution black is?

A. Hyrogen chloride
B. Hydrogen sulphide
C. Sulphur (IV) oxide
D. Sulphur (VI) oxide

Question 24:

• JAMB 1998

3CuO_(s) + 2NH_3(g) → 3Cu_(s) + 3H₂O_(I) N_2(g) (i).
2NH_3(g) + 3Cl_2(g) → 6HCl_(g) + N_2(g) (ii).
4NH_3(g) + 3O_2(g) → 6H₂O_(I) + 2N_2(g) (iii).
The reactions represented by the equations above demonstrate the?

A. Basic properties of ammonia
B. Acidic properties of ammonia
C. Reducing properties of ammonia
D. Oxidizing properties of ammonia

Question 25:

• JAMB 1998

A solution containing chloride ions gives white precipitate with silver trioxonitrate(V) Solution. The precipitate will be insoluble in dilute?

A. HNO ₃ but soluble in ammonia solution
B. HNO₃ and ammonia solution
C. HCl but soluble in ammonia solution
D. HCl and in ammonia solution