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Question

In the extraction of nickel by Mond's process, the metal is obtained by:

A
electrochemical reduction
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B
thermal decomposition
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C
chemical reduction by aluminium
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D
reduction by carbon
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Solution

The correct option is B thermal decomposition
In Mond's process, nickel oxide is reacted with water gas, a mixture of H2 and CO, at atmospheric pressure and a temperature of 50oC. The oxide is thus reduced to impure nickel. Reaction of this impure material with residual carbon monoxide gives the toxic and volatile compound, nickel tetracarbonyl, Ni(CO)4. This compound decomposes on heating to about 230oC to give pure nickel metal and CO, which can then be recycled.
Therefore thermal decomposition is the correct answer.

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