Chemistry Past Questions and Answers

2Cl^2(g) + 2H₂O_(g) 4HCl_(g) + O_2(g)
âˆ†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:

2X_(g) + Y_(g) â†’ 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) Â° (Y) ₂
D R = K (X) ₂(Y)Â°

Question 23:

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:

3CuO_(s) + 2NH_3(g) â†’ 3Cu_(s) + 3H₂O_(I) N_2(g) (i).
2NH_3(g) + 3Cl_2(g) â†’ 6HCl_(g) + N_2(g) (ii).
4NH_3(g) + 3O_2(g) â†’ 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:

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