'The process of separation or deposition of crystals from a hot saturated solution on gentle cooling of the solution is called crystallisation'. With reference to the statement explain what is meant by 'water of crystallisation'. State which physical properties of a crystal are correlated with the water of crystallisation.

Differentiate between 'hydrated' & 'anhydrous' crystals. Give the chemical formula of the following hydrated crystals:

(a) Washing soda

(b) Gypsum

(c) Blue vitriol

(d) Epsom salt

(e) Glauber's salt.

State which crystal from (a) to (e) is a pentahydrate.

Differentiate the function of concentrated sulphuric acid as a drying agent & as a dehydrating agent. Is fused calcium chloride a dehydrating or a desiccating agent. Give reasons.

Give a reason why metals are arranged in a series called - 'activity series of metals'. Name a metal which reacts with

(a) Cold water

(b) Boiling water

(c) Steam

to liberate hydrogen in each case.