Question

a piece of granulated zinc was dropped into copper sulphate solution,after some time the colour of solution changed from Blue to colourless .why

Answer 1

Displacement reaction takes place where a more reactive metal displaces a less reactive metal

here since zinc is more reactive than copper it displaces copper from its solution

Answer 2

this happens because of the displacement reaction between zinc and copper sulphate solution

Zn+CuSO4 ----> ZnSO4+Cu