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Gravity Separation

An impure met...

Question

An impure metal is allowed to react with carbon monoxide at $50^{\circ} C$ and the volatile gas thus formed is collected and heated further to about $200^{\circ} C$ . Thus, procedure gives the metal of 99.99% purity. What is the metal?

A

Ni

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B

Fe

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C

Cr

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D

None of these

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Solution

The correct option is A Ni
The process mentioned is the Mond's process.
Mond Process for Refining Nickel: In this process, nickel is heated in a stream of carbon monoxide forming a volatile complex, nickel tetracarbonyl.

$H_{2} O (g) + C \to C O (g) + H_{2}$

$N i + 4 C O 50^{o} C - -- \to N i (C O)_{4}$

The carbonyl is subjected to a higher temperature so that it is decomposed giving the pure metal:

$N i (C O)_{4} 200^{o} C - -- \to N i + 4 C O$

Option A is correct.

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