Question

In the electrolytic refining of Zn, is used as the cathode.

• A. crude $Zn$
• B. $Al$
• C. pure $Zn$
• D. $Ca{F}_2$

Answer 1

The correct option is B $Al$

In the electrolytic refining of zinc, impure zinc is used as anode and acidified $ZnS{O}_4$ that is, $ZnS{O}_4+H_{2}S{O}_4$ is used as the electrolyte. Since zinc can react with even dil.$H_{2}S{O}_4$, we use aluminium as the cathode instead of pure zinc.