Ncert Exercises & Solutions

6.12 Describe a method for refining nickel.

Nickel is refined by Mond’s process. In this process, nickel is heated in the presence of carbon monoxide to form nickel tetracarbonyl, which is a volatile complex. $Ni + 4 CO \overset{330 - 350 K}{\to} Ni {(CO)}_{4}$
$Nickel tetracarbonyl$

Then, the obtained nickel tetracarbonyl is decomposed by subjecting it to a higher temperature (450 − 470 K) to obtain pure nickel metal.
$Ni {(CO)}_{4} \overset{450 - 470 K}{\to} Ni + 4 CO$
$Nickel Nickel$
$tetracarbonyl$

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