Water - Jamb Chemistry Past Questions and Answers

Question 66:

• JAMB 2009

Water can be obtained as the only product during the

A. Combustion of hydrocarbons
B. Neutraliization of an acid by base
C. Combustion of hydrogen
D. Electrolysis of brine

Question 67:

• JAMB 2010

The droplets of water observed around a bottle of milk taken out of the refrigerator is due to the fact that the

A. Water vapour in the air around the bottle gains some energy from the bottle
B. Temperature of the milk drops as it loses heat into the surroundings
C. Saturated vapour pressure of the milk is equal to the atmospheric pressure
D. Water vapour in the air around the bottle loses some of its energy to the bottle

Question 68:

• JAMB 2010

Permanent hardness of water can be removed by

A. Filtration
B. Adding slaked lime
C. Adding caustic soda
D. Boiling

Question 69:

• JAMB 2010

Coffee stains can best be removed by

A. Kerosine
B. Turpentine
C. A solution of borax in water
D. Ammonia solution

Question 70:

• JAMB 2010

Which of the following is used in rocket fuels?

A. HNO₃
B. CH₃COOH
C. H₂SO₄
D. HCl