1.

The ion that causes hardness in water is

2.

Which of the following statements about the properties of water are correct? It

I. is colourless and tasteless

II. is neutral to litmus paper

III. turns red litmus paper blue

IV. is a universal solvent

3.

A substance that could be used in large scale treatment of domestic water is

4.

The simplest way of making well water suitable for laundry is by

5.

The ion that causes hardness in water is

6.

Which of the following chemical symbols can be used to remove permanent hardness of water?

7.

Which of the following substances can exist in all the three states of matter at 0°C?

8.

Which of the following is the cleanest source of drinking water?

9.

Which of the following substances is used to purify water for town supply?

10.

The method of separation used in the treatment of water at the water works is

11.

Alum is added to water during treatment to

12.

Which of the following types of water would be most contaminated by waste substances?

13.

Chlorine gas is passed through water during filtration to

14.

Arrange the following sources of water in the order of increasing contamination.

I. Rain
II. Stream
III. Well
IV. Borehole

15.

Water is sometimes referred to as a universal solvent because it

16.

Which of the following ways of treating water makes the water soft?

17.

Water that needs a small amount of soap to form lather is described as

18.

Water that requires more soap in order to form lather is described as

19.

One best way of making water safe for drinking is by

20.

Arrange the following types of water in order of increasing hardness.

I. Tap water
II. Sea water
III. Distilled water
IV. Rain water

21.

The method of purification of water containing very little impurities is

22.

Boiling and chlorination are used in water purification to

23.

Water that forms lather readily with soap is said to be

24.

The simplest way of making well water suitable for laundry purpose is by

25.

Which of the following methods of treating water makes it soft?

26.

Water contains two elements, hydrogen and oxygen, in the ratio of

27.

Which of the following statements about the properties of water are correct? It

I. is colourless and tasteless

II. is neutral to litmus paper

III. turns red litmus paper blue

IV. is a universal solvent

28.

One advantage of soft water over hard water is that soft water

29.

The reason why alum is added to water during treatment is to

30.

Which of the following physical properties of water are correct? Water

I. is a colourless liquid.

II. is a universal solvent.

III. boils at 100°C at standard atmosphere pressure.

IV. has a density of 5kgcm^-3 at 4°C.

31.

Which of the following chemical compounds is used in removing hardness in water?

32.

An advantage of soft water over hard water is that soft water