KCET · Chemistry · General Principles and Processes of Isolation of Metals

In the electrolytic refining of zinc

A graphite is at the anode
B the impure metal is at the cathode
C the metal ion get reduced at the anode
D acidified zinc sulphate is the electrolyte

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Answer & Solution

Correct Answer

(D) acidified zinc sulphate is the electrolyte

Step-by-step Solution

Detailed explanation

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
\[
\mathrm{Zn}^{2+}+2 \mathrm{e}^{-} \longrightarrow \underset{\text { pure }}{\mathrm{Zn}}
\]
At anode
\[
\underset{\text { impure }}{\mathrm{Zn}} \longrightarrow \mathrm{Zn}^{2+}+2 \mathrm{e}^{-}
\]

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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