The crystalline substance that does not contain water of crystallization is:

1. Plaster of paris
2. Potash alum
3. Potassium permanganate
4. Epsom salt

Table salt becomes sticky in the presence of moisture because :

1. It is deliquescent
2. It is hygroscopic
3. It contains impurities which are deliquescent
4. It is a good drying agent.

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