Question

Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then a small amount of hot water was added to dissolve it (Step I). On cooling, beautiful blue coloured crystals got separated (Step II). 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

Answer 1

Answer:

C) both physical changes.

Explanation:

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.