A metallic piece (X) is dropped into copper sulphate solution. After some time, the blue colour of the solution changes to green. The change which has occurred is
A Physical and reversible change
B Physical and irreversible change
C Chemical and reversible change
D Chemical and irreversible change.
due to the presence of copper in the metal the copper oxidzes faster an turn the solution green this same is done for extracting silver from aqua regia or royal water and the copper also can get crystalized