Chemistry and Industry - Jamb Chemistry Past Questions and Answers

Question 31:

• JAMB 1987

When water drops are added to calcium carbide in a container and the gas is passed through a jet and lifted, the resultant flame is called an?

A. Oxyethylene flame
B. Oxyhydrocarbon flame
C. Oxyacetylene flame
D. Oxymethane flame

Question 32:

• JAMB 1987

In the purification of town water supply, alum is used principally to?

A. Kill bacteria
B. Control the pH of water
C. Improve the taste of the water
D. Coagulate small pasrticles of mud

Question 33:

• JAMB 1987

Which of the following water samples will have the highest titre value when titrated for the Ca²⁺ ions using soap solution?

A. Permanently hard water after boiling
B. Emporarily hard water after boiling
C. Rain water stored in a glass jar for two years
D. Permanent hard water passed through permuitit

Question 34:

• JAMB 1987

Oil spillage in ponds and creeks can be cleaned up by?

A. Burning off the oil layer
B. Spraying with detergent
C. Dispersal with compressed air
D. Spraying with hot water

Question 35:

• JAMB 1988

Which of the following is used in fire extinguishers?

A. Carbon (ll) oxide
B. Carbon (lV) oxide
C. Sulphur (lV) oxide
D. Ammonia