WAEC Chemistry Past Questions & Answers - Page 107

531.

Consider the reaction represented by the following equation: N2(g) + 3H2(g) ⇌ 2NH3(g); ∆Hϴ = -xkJ mol-1. Which of the following conditions would increase the yield of NH3?

A.

Addition of iron catalyst

B.

Increase in the temperature of the system

C.

Increase in the volume occupied by reactants

D.

Increase in the total pressure of the system

Correct answer is D

No explanation has been provided for this answer.

532.

Which of the following factors would affect the equilibrium constant?

A.

Concentration

B.

Temperature

C.

Pressure

D.

Volume

Correct answer is B

Equilibrium constants aren't changed if you change the concentrations of things present in the equilibrium. The only thing that changes an equilibrium constant is a change of temperature.

534.

Which of the following salts on hydrolysis would give an alkaline solution?

A.

NH4CI(s)

B.

AICI3(s)

C.

CH3COONa(s)

D.

NH4NO3(s)

Correct answer is C

No explanation has been provided for this answer.

535.

The gases produced when Cu(NO3)2(s) was heated are

A.

NO and NO2

B.

O2 and NO

C.

NO2 and N2O4

D.

O2 and NO2

Correct answer is B

No explanation has been provided for this answer.