The salt which gives water vapour on heating is called :

1. Hydrated
2. Hygroscopic
3. Deliquescent
4. Anhydrous

Which of the following salts cause permanent hardness of water ?

1. Calcium sulphate
2. Calcium bicarbonate
3. Sodium chloride
4. Magnesium nitrate

Temporary hardness of water can be removed by

1. filtering
2. boiling
3. loading
4. none of the above

Assertion (A): Water is a universal solvent.

Reason (R): We use water daily for drinking, washing, bathing, etc.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.