Question

A zinc granule was placed in a beaker containing copper sulphate solution. On observing the granule the next day, it was noticed that

(a) the zinc granule remained as it was(b) the colour of the granule changed(c) the zinc granule became thinner(d) the zinc granule became thicker

Answer 1

The colour of zinc granule changed due to the following reaction:
$$\begin{gathered} Zn\left(s\right)+CuS{O}_4\left(aq\right)\to Cu\left(s\right)+ZnS{O}_4\left(aq\right) \\ whitereddish-brown \end{gathered}$$
Zinc is more reactive than copper. So, it will displace copper from copper sulphate solution. The blue colour of the solution will fade away and a reddish-brown layer of copper will be deposited on zinc granule.