Chemistry and Industry - Jamb Chemistry Past Questions and Answers

Question 21:

• JAMB 1985

Which of the following substances is the most abundant in the universe?

A. Carbon
B. Air
C. Water
D. Oxygen
E. Hydrogen

Question 22:

• JAMB 1985

The function of sulphur during vulcanization rubber is to?

A. Act as catalyst for the polymerization of rubber molecules
B. Convert rubber from thermosetting to thermo plastics polymer
C. From chains which bind rubber molecules together
D. Break down rubber polyer
E. Shorten the chain length of rubber polyer

Question 23:

• JAMB 1986

The reaction Mg + H₂O → MgO + H₂ takes place only in the presence of?

A. Excess Mg ribbon
B. Excess cold water
C. Very hot water
D. Steam

Question 24:

• JAMB 1986

The exhaust fumes from a garage in a place that uses petrol of high sulphur content are bound to contain?

A. CO and SO₃
B. CO and SO₂
C. CO,SO₂ and SO₃
D. CO and H₂S

Question 25:

• JAMB 1986

When chlorine is passed into water and subsequently exposed to sunlight, the gas evolved is?

A. HCl
B. HOCl
C. O₂
D. Cl₂O