Question

A metallic piece X is dropped into copper sulphate solution. after some time, the blue colour of the copper sulphate solution turns green. What change has occured

Answer 1

It is a displacement reaction.
The metal X has displaced copper from its salt solution.

Answer 2

Answer:

it is an irreversible and chemical change.

Explanation:

iron reacts with blue coloured solution of copper sulphate and forms a "hew substance (green coloured solution of iron sulphate) and cannot be converted back to the original solution