10. Two drops of dilute sulphuric acid were added tolg of copper sulphate powder and the
small amount of hot water was added to dissolve it (step 1). On cooling, beautiful blue
coloured crystals got separated (step 11). Step I and step II are:
(a) physical and chemical changes respectively.
(b) chemical and physical changes respectively.
(c) both physical change.
(d) both chemical change.
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Correct option is (C).
Dissolution of copper sulphate powder in water in presence of sulphuric acid is a physical change. On cooling this hot solution, cystals of copper sulphate separate out, which is also a physical change.
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