A metallic piece (X) is dropped into copper sulphate solution. After some time, the blue colour of the solution changes to green.

Metal X and the change which has occurred are respectively

Options

A. Aluminium and physical, reversible change
B. Magnesium and physical, irreversible change
C. Iron and chemical, reversible change
D. Iron and chemical, irreversible change.

Answer

D

Explanation

Metal X is iron which reacts with blue coloured solution of copper sulphate and forms a new substance (green coloured solution of iron sulphate). It is an irreversible and chemical change.