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  4. In the electrolytic refining of Zinc ,.................

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Q. In the electrolytic refining of Zinc ,.................

KCETKCET 2010General Principles and Processes of Isolation of Elements

Solution:

In the electrolytic refining of zinc, anode is made up of impure zinc while a strip of pure zinc acts as cathode. An acidified solution of zinc sulphate acts as electrolyte. When electricity is passed, following reactions occur

At cathode

$Zn ^{2+}+2 e^{-} \longrightarrow \underset{\text { pure }}{ Zn }$

At anode

$\underset{\text{impure}}{Zn} \longrightarrow Zn ^{2+}+2 e^{-}$