(a) Define efflorescence. Give examples.

(b) Define deliquescence. Give examples.

Answer the questions below:

(a) What name is given to the water in the compound copper sulphate-5-water?

(b) If copper sulphate-5-water is heated, anhydrous copper sulphate is formed. What is it's colour?

(c) By what means, other than heating, could you dehydrate copper sulphate-5-water and obtain anhydrous copper sulphate?

(d) Name a deliquescent salt.

(e) Why does hydrated copper sulphate turn white on heating?

Give reasons for the following:

(a) Sodium hydrogen sulphate is not an acid, but it dissolves in water to give hydrogen ions according to the equation

NaHSO₄ ⇌ H⁺ + Na⁺ + SO₄^2-

(b) Anhydrous calcium chloride is used in a desiccator.

Explain clearly how conc. H₂SO₄ is used as a dehydrating as well as a drying agent.