Chemical equilibrium - Jamb Chemistry Past Questions and Answers

Question 26:

• JAMB 2005

NH₄Cl_(s) ↔ NH_3(g) + HCL_(g)
The reaction above can only attain equilibrium if

A. A gaseous reactant is added
B. One of the products is removed
C. It is in a closed system
D. It is an open system

Question 27:

• JAMB 2006

Dynamic equilibrium describes a situation where

A. A reaction gives back the reactant
B. Te concentration of the reactant and products is equal
C. Both forward and and reverse reactions proceed at the same rate
D. Reactants are converted to products

Question 28:

• 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 29:

• 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

Question 30:

• JAMB 2010

2H_2(g) + O_2(g) → 2H₂O_(g) ΔH = -ve
what happens to the equilibrium constant of the reaction above if the temperature is increased?

A. It is unaffected
B. It becomes zero
C. It decrease
D. It increase