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$Ni + 4 CO \overset{330 - 350 K}{⟶} Ni (CO)_{4} \overset{450 - 470 k}{⟶} Ni + 4 CO$ This sequence of reactions involved in

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Mond's process for refining of nickel

Van Arkel method for refining of nickel

Zone refining of nickel

Refining of nickel by distillation

answer is B.

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Detailed Solution

$Ni + 4 CO \overset{330 - 350 K}{⟶} Ni (CO)_{4} \overset{450 - 470 k}{⟶} Ni + 4 CO$

Pure nickel is refined.

Similar things happen in Monds process.

In the Mond process of refining of Nickel : Nickel is heated in presence of carbon monoxide to form nickel tetracarbonyl and the obtained nickel tetracarbonyl is decomposed by subjecting it to a higher temperature to obtain a pure nickel metal.

Therefore, this sequence of reactions is involved in Mond's process for refining of nickel.

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