Write the chemical reactions related to Mond process for refining nickel metal.

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Solution

Nickel is heated in a stream of CO to form nickel tetra carbonyl complex which is highly volatile.
$N i + 4 C O 330 - 350 K - ----- \to N i (C O)_{4}$
Nickel tetra carbonyl is heated at high temperature. It decomposes to give pure nickel.
$N i (C O)_{4} 450 - 470 K - ----- \to N i + 4 C O$

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Describe the principle involved in each of the following processes.

(i) Mond process for refining of Nickel.
(ii) Column Chromatography for purification of rare elements.

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