Question

State what would happen if some zinc pieces are placed in blue copper sulphate solution

Answer 1

So, here , on adding zinc to CuSO4 solution  displaces copper from copper sulphate & forms zinc sulphate solution. This is indicated by colour change from blue to colourless. CuSO4 solution has a blue colour while ZnSO4 solution is colourless. Zn(s) + CuSO4(aq) -> Cu(s) + ZnSO4 (aq).