Jamb Chemistry 2005 Past Questions and Answers

Question 36:

• JAMB 2005

The density of a certain gas is 1.98gdm^-3 at s.t.p. What is the molecular mas of the gas?

A. 44.0 g
B. 54.0 g
C. 26.0 g
D. 31.0 g

Question 37:

• JAMB 2005

When pure aluminium metal is heated to red hot in the presence of nitrogen gas, the compound formed is

A. Al₂N
B. Al₂N₂
C. AlN
D. Al₂N₃

Question 38:

• JAMB 2005

When pure aluminium metal is heated to red hot in the presence of nitrogen gas, the compound formed is

A. Al₂N
B. Al₂N₂
C. AlN
D. Al₂N₃

Question 39:

• JAMB 2005

A dense white fume is formed when ammonia gas reacts with

A. O_2(g)
B. H_2(g)
C. Cl_2(g)
D. HCl_(g)

Question 40:

• JAMB 2005

N_2(g) + 3H_2(g) ↔ 2NH_3(g) ΔH = -90 kJ
In the equation above, the yield of ammonia can be decreased by

A. Increasing the pressure
B. Removing the ammonia as it is formed
C. Increase the temperature
D. Adding a catalyst