Question

the blue colour of cuso4 slowly dissapperss when zinc rod is dipped in

Answer 1

The following chemical reaction takes place:

Zn + CuSO₄ ---------> ZnSO₄ + Cu

The blue colour of the solution is due to the presence of Copper sulphate (CuSO₄);

As the reaction proceeds the Copper from CuSO₄ is slowly displaced by Zinc thus forming ZnSO₄ which is colourless, so the blue colour disappears slowly and a colourless solution starts forming.

Hope it helps!!