the blue colour of CuSO4 solutions is slowly discharged when a rod of zinc is dipped in it . explain..
Cu2+ has a greater electrode reduction potential as compared to Zn. Therefore, Zn rod is dipped in copper sulphate solution, Cu2+ ions oxidize Zn to Zn2+ ions and get reduced to Cu. As a result, the blue colour of copper sulphate solution slowly fades away, due to presence of more and more Zn2+ ions in the solution and reduction in concentration of Cu2+ ions.