Two beakers $\mathrm{A}$ and $\mathrm{B}$ contain iron $\left(\mathrm{I}\mathrm{I}\right)$ sulphate solution. In breaker $\mathrm{A}$, a small piece of copper and in beaker $\mathrm{B}$ a small piece of zinc are placed. It is found that after some time a grey deposit forms on zinc but not on copper. From these observations it can be concluded that:

Zinc granules are placed in each of the four solutions $\mathrm{A},\mathrm{}\mathrm{B},\mathrm{}\mathrm{C}$ and $\mathrm{D}\mathrm{}$ as shown. Colour change would be observed in

Two beakers A and B contain an aqueous solution of FeSO₄. In the beaker A, zinc granules and in beaker B copper turnings have been placed. A grey coating was observed on zinc but not on copper. From the above observations, we can conclude.

A student performed the following four experiments.


The experiments in which solid deposition on the metal plate will be observed are: