Which of the following metal is purified by Mond carbonyl method ?

T i

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G e

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Z r

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N i

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Solution

The correct option is D $N i$
Nickel $(N i)$ Is purified by Mond carbonyl process. In this process, impure nickel is heated with carbon monoxide, so that it gets converted into nickel carbonyl, a volatile compound. This compound on heating at higher temperature gets dissociate to give pure $N i$ metal.

$N i I m p u r e + 4 C O 330 - 350 K ⟶ N i (C O)_{4} 450 - 470 K ⟶ N i P u r e + 4 C O$

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T i, B, Z r, P b, H g

Four metals and their methods of refinement are given :

(i) $N i, C u, Z r, G a$

(ii) Electrolysis, van Arkel process, Zone refining, Monds process

Choose the right method for each metal.

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

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