Chemistry And Industry - Chemistry Jamb Past Questions and Answers

Question 6 :

• JAMB 1980

Hardening of an oil may be achieved by?

A. Boiling the oil with water
B. Boiling the oil with a catalyst
C. Treating the oil with sodium hydroxide
D. Treating the oil with hydrogen and catalyst
E. Distilling oil under reduced pressure

Question 7 :

• JAMB 1980

Hardening of an oil may achieved by?

A. Boiling the oil with water
B. Boiling the oil with a catalyst
C. Treating the oil with sodium hydroxide
D. Treating the oil with hydrogen and catalyst
E. Distilling oil under reduced pressure

Question 8 :

• JAMB 1980

The best way of collecting chlorine is?

A. By downward displacement of air
B. By upward displacement of air
C. Over water
D. Under water
E. Over mercury

Question 9 :

• JAMB 1980

If one of the following oxides is heated with hydrogen or carbon using a bunsen burner, it is not reduced to the metal. Which one is it?

A. Lead oxide
B. Magnesium oxide
C. Copper oxide
D. Tin oxide
E. Iron oxide

Question 10 :

• JAMB 1980

A mixture of ethanol, sodium dichromate, and water is allowed to drop gradually into a boiling solution containing one part concentrated H₂SO₄ and the liberate gas is collected by cooling it with ice water to give a liquid. This liquid is?

A. Ethanoic acid
B. Acetaldehyde
C. Ethyl acetate
D. Methanol
E. Ethylene