Water - Chemistry Jamb Past Questions and Answers

Question 76 :

• JAMB 2012

Chlorination of water for town supply is carried out to

A. Make the water colourless
B. Remove germs from the water
C. Make the water tastedful
D. Remove odour from the water

Question 77 :

• JAMB 2013

The solvent used for removing grease stain is

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

Question 78 :

• JAMB 2013

In a water body, too much sewage leads to

A. A decrease in the temperature of the water which cause in death of aquatic animals
B. An increase in the number of aquatic animals in the water
C. An increase in the bacterial population which reduces the level of oxygen in the water
D. A decrease in the bacterial population which increases the level of oxygen in the water

Question 79 :

• JAMB 2014

Water is said to be temporarily hard when it contains

A. Ca (HCO₃)₂ and Mg (HCO₃)₂ salts
B. Ca (HCO₃)₂ and CaCO₃ SALTS
C. Mg(HCO₃)₂ and CaSO₄ salts
D. CaSO₄ and Ca(HCO₃)₂ salts

Question 80 :

• JAMB 2014

On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as

A. Efflorescence
B. Diliquescence
C. Hygroscopy
D. Hydrolysis