Jamb Chemistry 1985 Past Questions and Answers

Question 6:

• JAMB 1985

A certain industrial process is represented by the chemical equation 2A_(g) + B_(g) \(\to\) C_(g) + 3D_(g) \(\Delta\)H = X kJmol^-1. Which of the following conditions will favour the yield of the products?

A. Increase in temperature, decrease in pressure
B. Increase in temperature, increase in pressure
C. Decrease in temperature,increase in pressure
D. Decrease in temperature, decrease in pressure
E. Constant in temperature, increase in pressure

Question 7:

• JAMB 1985

2MnO^-₄ + 10Cl^- + 16H⁺ → 2Mn²⁺ + 5Cl₂ + 8H₂O. Which of the substances serves as an oxidizing agent?

A. Mn²⁺
B. Cl^-
C. H₂O
D. MnO^-₄
E. Cl₂

Question 8:

• JAMB 1985

Which of the following metals will displace iron from a solution of iron(ll)tetraoxosulphate(lV)?

A. Copper
B. Mercury
C. Silver
D. Zinc
E. Gold

Question 9:

• JAMB 1985

In the reaction H_2(g)O \(\to\) H_2(g) + 1/2O_2(g)
ΔH = -2436000 KJ, which of the following has no effect on the equilibrium position?

A. Adding argon to the system
B. Lowering the temperature
C. Adding hydrogen to the system
D. Decreasing the pressure
E. Increasing the temperature

Question 10:

• JAMB 1985

Complete hydrogenation of ethyne yields?

A. Benzene
B. Methane
C. Ethane
D. Ethene
E. Propane