Question

Two drops of dilute sulphuric acid were added to 1 gram of copper sulphate

powder and then small amount of hot water was added to dissolve it (Step-I).

On cooling, beautiful blue coloured crystal got separated (Step-II). Step I and

Step II are:​

Answer 1

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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.