Question

A zinc plate was put into a solution of copper sulphate kept in a glass container. Itwas found that blue colour of solution gets fader and fader with the passage of time. After few days when zinc plate was taken out of the solution , a number of holes were observe on it.
(A) state the reason for changes obser on the zn plate.
(B) write chem equa for the reaction involved.

Answer 1

Reaction:

Zn + CuSO4 = ZnSO4 + Cu

The above reaction is an example of displacement reaction. Here Zn2+ ions being more reactive than Cu2+ ions displaces it and the blue colour of CuSO4 fades out.

Answer 2

(A) zinc is more reactive than copper. it displaces Cu from CuSO4 and hence copper gets deposited on zinc plate. (B) Zn+CuSO4 - ZnSO4 + Cu