Which of the following is a deliquescent salt ?

1. CuSO₄
2. FeCl₃
3. KCl
4. ZnSO₄

If a salt on heating gives water vapour, then that salt is:

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

Temporary hardness of water can be removed by:

1. Adding sodium chloride
2. Boiling
3. Adding calcium carbonate
4. Leaving it for a few hours.

The salt which does not contain any water of crystallisation is :

P — Blue vitriol

Q — Gypsum

R — Baking soda

1. Only P
2. Only Q
3. Only R
4. Both Q and R