Jamb Chemistry 1989 Past Questions and Answers

Question 31:

• JAMB 1989

A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is

A. Copper
B. Aluminium
C. Zinc
D. Sodium

Question 32:

• JAMB 1989

A metal is extracted from its ore by the electrolysis of its molten chloride and it displaces lead from lead (ll) trioxonitrate (V) solution. The metal is

A. Copper
B. Aluminium
C. Zinc
D. Sodium

Question 33:

• JAMB 1989

Mortar is NOT used for under-water construction because

A. It hardens by lose of water
B. Its hardening doe not depend upon evaporation
C. It requires concrete to harden
D. It will be washed away by the flow of water

Question 34:

• JAMB 1989

Which of the following is NOT involved in the extraction of metals from their ores?

A. Reduction with carbon
B. Reduction with other metals
C. Reduction by electrolysis
D. Oxidation with oxidizing agents

Question 35:

• JAMB 1989

When excess chlorine is mixed with ethene at room temperature, the product is

A. 1,2 - dichloroethane
B. 1,2 - dichloroethene
C. 1,1 - dichloroethane
D. 1, 1 - dichloroethene