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 21· Water· WAEC
A test for pure water is that it
Explanation and discussion
Question 22· Water· JAMB
Soap forms scum in hard water because of dissolved
Explanation and discussion
Question 23· Water· WAEC
Anhydrous copper(II) sulphate is used to test for water because it turns from
Explanation and discussion
Question 24· Water· WAEC
In water treatment, alum is added to
Explanation and discussion
Question 25· Water· JAMB
Permanent hardness of water can be removed by
Explanation and discussion
Question 26· Water· JAMB
Water is called a universal solvent because it
Explanation and discussion
Question 27· Water· JAMB
Sodium reacts with cold water to produce
Explanation and discussion
Question 28· Water· WAEC
Temporary hardness in water is caused by dissolved
Explanation and discussion
Question 29· Water· WAEC
Boiling removes temporary hardness because calcium hydrogencarbonate
Explanation and discussion
Question 30· Water· WAEC
Temporary hardness of water can be removed by
Explanation and discussion
Question 31· Water· WAEC
In water treatment, the water is passed through sand beds in order to
Explanation and discussion
Question 32· Water· WAEC
The test for water is that it turns anhydrous copper(II) sulphate
Explanation and discussion
Question 33· Water· WAEC
Rain water is the purest natural water, but it may contain dissolved
Explanation and discussion
Question 34· Water· WAEC
Which of the following methods removes temporary hardness of water but not permanent hardness?
Explanation and discussion
Question 35· Water· JAMB
When calcium hydrogentrioxocarbonate(IV) solution is boiled, it forms
Explanation and discussion
Question 36· Water· JAMB
Anhydrous copper(II) tetraoxosulphate(VI) is used to test for water because it
Explanation and discussion
Question 37· Water· WAEC
Permanent hardness can be removed by adding
Explanation and discussion
Question 38· Water· WAEC
Caustic soda pellets left open in the laboratory become wet and finally form a solution. They are
Explanation and discussion
Question 39· Water· WAEC
White anhydrous copper(II) tetraoxosulphate(VI) turns blue when it
Explanation and discussion

Practise Chemistry like the real exam. A timed CBT, your score, and the topics to fix.

Start a Chemistry test

JAMB and WAEC Chemistry questions: Water

A test for pure water is that it

Soap forms scum in hard water because of dissolved

Anhydrous copper(II) sulphate is used to test for water because it turns from

In water treatment, alum is added to

Permanent hardness of water can be removed by

Water is called a universal solvent because it

Sodium reacts with cold water to produce

Temporary hardness in water is caused by dissolved

Boiling removes temporary hardness because calcium hydrogencarbonate

Temporary hardness of water can be removed by

In water treatment, the water is passed through sand beds in order to

The test for water is that it turns anhydrous copper(II) sulphate

Rain water is the purest natural water, but it may contain dissolved

Which of the following methods removes temporary hardness of water but not permanent hardness?

When calcium hydrogentrioxocarbonate(IV) solution is boiled, it forms

Anhydrous copper(II) tetraoxosulphate(VI) is used to test for water because it

Permanent hardness can be removed by adding

Caustic soda pellets left open in the laboratory become wet and finally form a solution. They are

White anhydrous copper(II) tetraoxosulphate(VI) turns blue when it