Jamb Chemistry 2001 Past Questions and Answers

Question 26:

• JAMB 2001

2SO_2(g) + O_2(g) ↔ 2SO_3(g)
ΔH = -189 kJ mol^-1
The equilibrium constant for the reaction above is increased by

A. Increasing the temperature of the system
B. Increase the pressure of the system
C. The addition of a catalyst to the system
D. Increasing the surface area of the vessel

Question 27:

• JAMB 2001

3Cu_(s) + 8HNO_3(aq) 3Cu(NO₃)_2(aq) + 4H₂O_(l) + 2NO_(g)
In the equation above, copper is

A. An electron acceptor
B. A base
C. An oxidizing agent
D. A reducing agent

Question 28:

• JAMB 2001

When ΔH is negative, a reaction is said to be

A. Ionic
B. Reversible
C. Exothermic
D. Endothermic

Question 29:

• JAMB 2001

As the concentration of an electrolyte reduces, the conductivity

A. Reduces to zero
B. Decreases
C. Increase
D. Is unaffected

Question 30:

• JAMB 2001

In which of the following reactions has the oxidation number of nitrogen increased?

A. 2NO_(g) + Br_2(l) → 2NOBr_(l)
B. 2NO_(g) + O_2(g) → 2NO_2(g)
C. FeSO_4(aq) + NO_(g) → Fe(NO)SO_4(s)
D. 2NO(g) + Cl_2(g) → 2NOCl(l)