The Mond process is used for the:

Extraction of

M o

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Purification of

N i

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Purification of

Z r

and

T i

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Extraction of

Z n

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Solution

The correct option is B Purification of $N i$
Mond's process is used for purification of $N i$
Vapour Phase Refining
Step 1:
Ni is heated in stream of $C O$ to form nickel tetracarbonyl
$N i + 4 C O 330 - 350 K - ----- \to N i (C O)_{4} Volatile$
Step2:
Volatile compound is subjected to higher temperature
$N i (C O)_{4} 450 - 470 K - ----- \to N i Pure metal + 4 C O$

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