Jamb Chemistry 2004 Past Questions and Answers

Question 26:

• JAMB 2004

The mass of silver deposited when a current of 10a is passed through a solution of silver salt for 4830s is
[Ag = 108, F = 96500 c mol^-1]

A. 108.0g
B. 54.0g
C. 27.0g
D. 13.5gq

Question 27:

• JAMB 2004

2CO_(g) + O_2(g) → 2CO_2(g)
Given that ΔH[CO]is -110.4 kJmol^-1 and ΔH[CO₂] is -393.0 kJmol^-1, the energy change for the reaction above is

A. -503.7 kJ
B. -282.6 kJ
C. +282.6 kJ
D. +503.7 kJ

Question 28:

• JAMB 2004

Which of the following hydrogen halides the highest entropy value?

A. HF
B. HCl
C. HBr
D. HI

Question 29:

• JAMB 2004

N₂O_4(g) ↔ 2NO_2(g)
In the endothermic reaction above, more product formation will be favoured by

A. A constant volume
B. An increase in pressure
C. A decrease in pressure
D. A decrease in volume

Question 30:

• JAMB 2004

Which of the following shows little or no net reaction when the volume of the system is decreased?

A. H_2(g) + I_2(g) ↔ 2HI_(g)
B. 2NO_2(g) ↔ N₂O_4(g)
C. PCl_5(g) ↔ PCl_3(g) + Cl_2(g)
D. 2O_3(g) ↔ 3O_2(g)