Question

The blue colour of copper sulphate solution start fading when zinc rod is dipped in it state reason for this change and also write chemical equation for the reaction involved

Answer 1

as zinc is more reactive than copper.cuso4+znwill give znso4+cu.

Answer 2

This is because zinc being a more electropositive metal than copper displaces it from its solutions.  CuSO4 + Zn --> ZnSO4 + Cu CuSO4 is blue in colour . But once all of the Cu ions are displaced by Zn ions, Blue to Colourless change is observed because ZnSO4 in aqueous solution is colourless This is a type of Displacement reaction.