JAMB Chemistry Past Questions & Answers - Page 247

1,231.

The production of ammonia by the haber process may be represented by the equilibrium equation N2(g) + 3H2(g) ↔ 2NH3 ∆H = -22KJ. Therefore the production of ammonia will be favoured by?

A.

only high pressure

B.

only high temperature

C.

a combination of high temperature and low pressure

D.

a combination of low temperature and high pressure

E.

low pressure

Correct answer is D

No explanation has been provided for this answer.

1,232.

When a solution of silver (l) nitrate is saturated with hydrogen sulphide, a black precipitate forms which is?

A.

H2S

B.

Ag2S

C.

PbS

D.

HNO3

E.

S

Correct answer is B

No explanation has been provided for this answer.

1,233.

1.00 g of the oxide of metal X (atomic mass = 64) gave 0.80 g of the metal when reduced with hydrogen.
The formula of the oxide is?

A.

X2O

B.

XO

C.

XO2

D.

X2O3

E.

X3O4

Correct answer is B

No explanation has been provided for this answer.

1,234.

In the chemical reaction A + B \(\to\) C + D, more of D is formed?

A.

if the concentrated of A is reduced

B.

if the concentrated of B is reduced

C.

if the concentrated of C is reduced

D.

if the concentration of C is increased

E.

if D is continuously removed from the reaction mixture

Correct answer is E

No explanation has been provided for this answer.

1,235.

In the reaction N2(g) + O(g)
↔ 2NO(g) produced i an increase in the total pressure will?

A.

cause less nitrogen to be produced in the equilibrium mixture

B.

cause less nitric oxide to be produced in the equilibrium mixture

C.

cause more nitric oxide to be produced in the equilibrium mixture

D.

cause more oxygen to be produced in the equilibrium mixture

E.

have no effect

Correct answer is E

If the pressure is increased, the position of equilibrium. moves in the direction of the fewest moles. of gas

However, because there is an equal number of particles on both sides, change in pressure will have no effect on the system.