JAMB and WAEC Chemistry questions: Water

39 questions with answers and explanations. Tap an option to check yourself.

All topics Acids, bases and salts · 58 Air · 37 Atomic structure and bonding · 59 Chemical combination · 58 Chemical equilibrium · 37 Chemistry and industry · 35 Electrolysis · 41 Energy changes · 38 Environmental pollution · 32 Kinetic theory of matter and gas laws · 45 Metals and their compounds · 47 Non-metals and their compounds · 45 Organic compounds · 72 Oxidation and reduction · 41 Rates of chemical reaction · 38 Separation of mixtures and purification · 42 Solubility · 36 Water · 39

Question 1· Water· JAMB
Which process exchanges the Ca²⁺ and Mg²⁺ ions in hard water for Na⁺ ions?
Explanation and discussion
Question 2· Water· JAMB
In water treatment, suspended particles are removed mainly by
Explanation and discussion
Question 3· Water· WAEC
A deliquescent substance
Explanation and discussion
Question 4· Water· JAMB
Temporary hardness of water is removed by
Explanation and discussion
Question 5· Water· WAEC
Water from a well tastes better than distilled water because it contains
Explanation and discussion
Question 6· Water· JAMB
Temporary hardness of water is caused by dissolved:
Explanation and discussion
Question 7· Water· JAMB
Ion-exchange resins soften water by
Explanation and discussion
Question 8· Water· JAMB
Which substance removes both temporary and permanent hardness of water?
Explanation and discussion
Question 9· Water· JAMB
Water is regarded as a compound because
Explanation and discussion
Question 10· Water· WAEC
Which substance is added during public water treatment to kill germs?
Explanation and discussion
Question 11· Water· WAEC
Hard water is undesirable for washing because it
Explanation and discussion
Question 12· Water· JAMB
Washing soda crystals, Na₂CO₃·10H₂O, lose water of crystallisation when exposed to air. They are described as
Explanation and discussion
Question 13· Water· JAMB
Pure water at normal atmospheric pressure boils at
Explanation and discussion
Question 14· Water· JAMB
Find the percentage of water by mass in Na₂CO₃·10H₂O. [Na = 23, C = 12, O = 16, H = 1]
Explanation and discussion
Question 15· Water· JAMB
A substance that absorbs moisture from the air and dissolves in it to form a solution is described as
Explanation and discussion
Question 16· Water· JAMB
Water dissolves many ionic substances because its molecules are
Explanation and discussion
Question 17· Water· JAMB
Which of the following is hygroscopic and is used as a drying agent?
Explanation and discussion
Question 18· Water· JAMB
In the treatment of town water, alum is added to
Explanation and discussion
Question 19· Water· WAEC
The formula of water shows that it contains hydrogen and oxygen in the ratio, by atoms, of
Explanation and discussion
Question 20· Water· JAMB
Hard water forms scum with soap because
Explanation and discussion

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JAMB and WAEC Chemistry questions: Water

Which process exchanges the Ca²⁺ and Mg²⁺ ions in hard water for Na⁺ ions?

In water treatment, suspended particles are removed mainly by

A deliquescent substance

Temporary hardness of water is removed by

Water from a well tastes better than distilled water because it contains

Temporary hardness of water is caused by dissolved:

Ion-exchange resins soften water by

Which substance removes both temporary and permanent hardness of water?

Water is regarded as a compound because

Which substance is added during public water treatment to kill germs?

Hard water is undesirable for washing because it

Washing soda crystals, Na₂CO₃·10H₂O, lose water of crystallisation when exposed to air. They are described as

Pure water at normal atmospheric pressure boils at

Find the percentage of water by mass in Na₂CO₃·10H₂O. [Na = 23, C = 12, O = 16, H = 1]

A substance that absorbs moisture from the air and dissolves in it to form a solution is described as

Water dissolves many ionic substances because its molecules are

Which of the following is hygroscopic and is used as a drying agent?

In the treatment of town water, alum is added to

The formula of water shows that it contains hydrogen and oxygen in the ratio, by atoms, of

Hard water forms scum with soap because