Chemistry and Industry - Jamb Chemistry Past Questions and Answers

Question 11:

• JAMB 1981

The brown coloration in nitric acid prepared in the laboratory can be removed by?

A. Heating the acid
B. Bubbling air through the acid
C. Cooling the acid
D. Adding a decolorizing agent
E. Adding a base

Question 12:

• JAMB 1981

In the preparation of ammonia, which of the following is used as the drying agent?

A. CaO
B. CaCI₂
C. Conc. H₂SO₄
D. P₂O₅
E. H₃PO₄

Question 13:

• JAMB 1981

Which one of the following metals is not normally extracted by chemical reduction because of its position in the electrochemical series?

A. Copper
B. Iron
C. Lead
D. Potassium
E. Zinc

Question 14:

• JAMB 1982

Water is poured over a white solid and a colourless neutral gas is evolved which burns with a sooty flame. The white solid is?

A. Calcium
B. Calcium oxide
C. Calcium carbide
D. Sodium peroxide
E. Sodium sulphate

Question 15:

• JAMB 1982

Which of the following CANNOT be obtained by fractional distillation of petroleum?

A. Ether
B. Methane
C. Butane
D. Ethene
E. Hydrogen