Vapour phase refining of nickel is carried out using:

I_{2}

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C l_{2}

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H C l

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C O

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Solution

The correct option is B $C O$
$N i + 4 C O 330 - 350 K - ----- \to N i (C O)_{4}$
$N i (C O)_{4} 450 - 470 K - ----- \to N i + 4 C O$

Nickel is heated in a stream of carbon monoxide to form a volatile complex named as nickel tetracarbonyl. This complex is decomposed at a higher temperature to obtain pure metal.

Option D is correct.

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Similar questions

Q. Nickel metal is purified by the vapour phase refining process. This process is based on the fact that:

Out line the principles of refining metals by the following method:

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List-I	List-II
(a) Mercury	(i) Vapour phase refining
(b) Copper	(ii) Distillation Refining
(c) Silicon	(iii) Electrolytic Refining
(d) Nickel	(iv) Zone Refining

Choose the most appropriate answer from the options given below:

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You are given the description of a process called “Vapour phase refining” Vapour Phase Refining: This involves converting the crude metal into a volatile intermediate. This intermediate should also decompose on heating at a reasonable temperature. Which of the following could be categorized under ‘Vapour phase refining’?

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