(i) Crystals of copper sulphate are heated in a test tube for some time.
(a) What is the colour of copper sulphate crystals before heating, and after heating?
(b) What is the source of liquid droplets seen on the inner upper side of the test tube during the heating process?
(ii) A metal 'X' when dipped in aqueous solution of aluminium sulphate no reaction is observed whereas when it is dipped in an aqueous solution of ferrous sulphate, the pale green solution turns colourless. Identify metal 'X' with reason.

Explanation

### Step-by-Step Solution

**(i) Crystals of copper sulphate are heated in a test tube for some time.**

**(a) What is the colour of copper sulphate crystals before heating, and after heating?**

1. **Before Heating:** The hydrated form of copper sulphate is represented as CuSO4·5H2O. In this form, the crystals are blue in color due to the presence of water of crystallization.

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