Efflorescent substance

Q.

Carbon dioxide and Sulphur dioxide gas can be distinguished by using:

1. Moist blue litmus paper

2. Lime water

3. Acidified potassium dichromate paper

4. None of these

Q.

Caustic soda is an absorbent for

Q. Match the following:

Set 1	Set 2
a)Deliquescent substance	(i)Washing soda
b)Efflorescent substance	(ii)Conc. sulphuric acid
c) Desiccants	(iii)Sodium hydroxide

1. a)-(iii), b)-(i), c)-(ii)
2. a)-(iii), b)-(ii), c)-(i)
3. a)-(ii), b)-(i), c)-(iii)
4. a)-(ii), b)-(iii), c)-(i)

Q.

The substances that loses the water of crystallization on exposure to dry air are called ________ substances.

1. Deliquescent

2. Efflorescent

3. Hygroscopic

4. Desiccant

Q.

State the term:

When a compound loses its water of crystallization on exposure to dry air.

Q. Which among the following is an example of efflorescent substances?

1. Washing soda
2. Jaggery
3. Magnesium chloride
4. Calcium nitrate