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Describe a method for refining nickel....

Describe a method for refining nickel.

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The impure nickel is heated in a stream of carbon monoxide at around 350 K.The nickel reacts with the CO to form a highly volatile nickel .The solid impurities are left behind.
`Ni(s)+4CO(g)toNi(CO)_(4)(g)`
On heating the nickel tetracarbonyl around 460K,the complex decomposes to give pure metal.
`Ni(CO)_(4)(g)toNi(S)+4CO(g)`
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