Answer:
(i)
Dissolve copper sulphate in water. (1/2)
Add few drops of dil. to get clear
solution. (1/2)
Heat the solution in China dish till crystallisation point
is reached. (1/2)
Cool this saturated solution. (1/2)
Crystals of pure copper sulphate are formed. Impurities
remain behind in the solution. (1/2)
Separate these crystals from solution by filtration and
dry. (1/2)
(ii) It is used to purify solids. (1)
(iii) Soluble impurities can be removed by this tech-nique
which are not removed by evaporation. (1)
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