MHT CET · Chemistry · General Principles and Processes of Isolation of Metals

Zirconium is refined by

A Liquation process
B Mond process
C Van Arkel method
D Electrolytic refining process

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Answer & Solution

Correct Answer

(C) Van Arkel method

Step-by-step Solution

Detailed explanation

Zirconium is refined by van Arkel method.
Zirconium is refined using the van Arkel technique. By heating metal in an evacuated vessel with iodine, oxygen and nitrogen present as impurities are eliminated. On a tungsten filament heated to roughly \(1800 \mathrm{~K}\), the metal iodide volatilizes and is degraded. On the filament, pure metal is deposited.
\(\begin{array}{l}
\underset{\text { (Impure) }}{\mathrm{Zr}}+2 \mathrm{l}_{2} \longrightarrow \mathrm{Zrl}_{4} \\
\mathrm{Zrl}_{4} \longrightarrow \underset{\text { (Pure) }}{\mathrm{Zr}}+2 \mathrm{l}_{2}
\end{array}\)

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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