Name a deliquescent substance.

Explain the following observations :

(i) Washing-soda become coated with a white powder when left exposed to the atmosphere.

(ii) In the expression anhydrous copper sulphate, what is meant by 'anhydrous'.

(iii) Why is fused calcium chloride or conc. sulphuric acid used in a desiccator.

What is 'water of crystallization' ? Name a crystalline salt which does not contain water of crystallization.

What would you observe, when the water of crystallization of a salt is removed by heating it.