Jamb Chemistry 1987 Past Questions and Answers

Question 1:

• 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)

Question 2:

• 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)

Question 3:

• JAMB 1987

Magnesium ribbon was allowed to burn inside a given gas P leaving a white solid residue Q. Addition of water to Q liberated a gas which produced dense white fumes with a drop of hydrochloric acid. The gas P was?

A. Nitrogen
B. Chlorine
C. Oxygen
D. Sulphur (IV) oxide

Question 4:

• JAMB 1987

The best treatment for a student who accidentally poured concentrated tetraoxosulphate (VI) acid on his skin in the laboratory is to wash the skin with?

A. Cold water
B. Sodium hydroxide solution
C. Iodine solution
D. Sodium trioxocarbonate (IV) solution

Question 5:

• JAMB 1987

In which of the following pairs of element is allotropy exhibited by each element?

A. Phosphorus and hydrogen
B. Oxygen and chlorine
C. Sulphur and nitrogen
D. Oxygen and sulphur