Chemical equilibrium - Jamb Chemistry Past Questions and Answers

Question 1:

• JAMB 1985

X + Y = Z is an equilibrium reaction. The addition of a catalyst?

A. Increase the amount of Z produced in a given time
B. Increases the rate of change in concentrations of X, Y and Z
C. Increases the rate of disapearance of X and Y
D. Increases the rate of the forward reaction
E. Decreases the amounts of X and Y left after the attainment of equilibrium

Question 2:

• JAMB 1985

X + Y = Z is an equilibrium reaction. The addition of a catalyst?

A. Increase the amount of Z produced in a given time
B. Increases the rate of change in concentrations of X, Y and Z
C. Increases the rate of disapearance of X and Y
D. Increases the rate of the forward reaction
E. Decreases the amounts of X and Y left after the attainment of equilibrium

Question 3:

• JAMB 1985

What is the formula of sodium gallate if gallium (Ga)shows an oxidation number of + 3?

A. NaGaO₃
B. Na₂Ga(OH)₃
C. NaGa(OH)₃
D. NaGa(OH)₄
E. NaGaO

Question 4:

• JAMB 1986

What is the consequences of increasing pressure on the equilibrium reaction ZnO_(s) + H_2(g) Zn_(s) + H₂O_(I)?

A. The equilibrium is driven to the left
B. The equilibrium is driven to the right
C. There is no effect
D. More ZnO is produced

Question 5:

• JAMB 1987

The reaction between sulphur (IV) oxide and oxygen is represented by the equilibrium reaction 2SO_2(g) + O_2(g) ↔ 2SO_3(g), ∆H = -196 kJ. What factor would influence increased production of SO_3(g)?

A. Addition of a suitable catalyst
B. Increase in the temperature of the reaction
C. Decrease in the temperature of the reaction
D. Decrease in the concentration of SO_2(g)