Chemistry 2009 Jamb Past Questions and Answers

Question 26 :

• JAMB 2009

Two equal bulbs, one containing ammonia and the other nitrogen are opened mouth - to - mouth to each other at room temperature. The entropy in the mixture of gases is likely to

A. Remain unchange
B. Increase
C. Decrease
D. Change

Question 27 :

• JAMB 2009

In the diagram above, which of the curves represents the evolution of oxygen with time in the equation 2KClO_3(s) → 2KCl_(s) + 3O_2(g)?

A. X
B. Y
C. Z
D. R

Question 28 :

• JAMB 2009

A catalyst increase the rate of a chemical reaction by providing a path that

A. Raise the activiation energy
B. Increase the temperature
C. Lowers the activation energy
D. Increase the concentration

Question 29 :

• JAMB 2009

CuO_(s) + H_2(g) ↔ Cu_(s) + H₂O_(l)
What is the effect of increasing the pressure on the equilibrium reaction above?

A. The equilibrium is shifted to the left
B. The equilibrium is shifted to the right
C. There is no effect
D. More H_2(g) is produced

Question 30 :

• JAMB 2009

The equilibrium of an endothermic reaction which proceeds with an increase in volume can be shifted in the reverse direction by

A. Increasing the temperature and decreasing the pressure
B. Increasing the pressure and increasing the temperature
C. Decreasing the temperature and increasing the pressure
D. Decreasing the pressure and decreasing the temperature