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Question

The following equation represents a method of purification of nickel by:


Ni(impure)+4CO320 K−−−→Ni(CO)4420 K−−−→Ni(pure)+4CO

A
Cupellation
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B
Mond's process
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C
Van Arkel method
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D
Zone refining
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Solution

The correct option is C Mond's process
Mond’s Method: It is specially used for Ni. The vapour phase refining of Ni on heating in a stream of CO forms Volatile Ni(CO)4. These vapours when subjected to still higher temperature, decompose to give pure metal.
Ni+4CO50oC−−Ni(CO)4230oC−−Ni+4CO

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