The following equation represents a method of purification of nickel by:

$N i (i m p u r e) + 4 C O 320 K - -- \to N i {(C O)}_{4} 420 K - -- \to N i (p u r e) + 4 C O$

Cupellation

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Mond's process

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Van Arkel method

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Zone refining

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Solution

The correct option is C Mond's process
Mond’s Method: It is specially used for $N i$ . The vapour phase refining of $N i$ on heating in a stream of $C O$ forms Volatile $N i (C O)_{4}$ . These vapours when subjected to still higher temperature, decompose to give pure metal.
$N i + 4 C O 50^{o} C - -- \to N i (C O)_{4} 230^{o} C - -- \to N i + 4 C O$

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Similar questions

N i + 4 C O (i m p u r e) 320 K \to N i (C O)_{4} 420 K \to N i + 4 C O (p u r e)

Which method of purification is represented by the following equations?

$N i + 4 C O$ $70^{\circ} C - -- \to$ $N i (C O)_{4}$ $180^{\circ} C - --- \to$ $N i + 4 C O$

T i (s) + 2 I_{2} (g) 523 K - -- \to T i I_{4} (g) 1700 K - --- \to T i (s) + 2 I_{2} (g)

Z r + 2 I_{2} \to Z r I_{4} 1088 K - --- \to Z r + 2 I_{2}

List-I	List-II
A. Mond’s process	1. Purification of Ag containing Pb
B. Van Arkel method	2. Purification of Ge
C. Cupellation	3. Purification of Nickel
D. Zone refining	4. Purification of Titanium

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