Question

Role of carbon monoxide in the extraction of nickel

Answer 1

When nickel is heated with carbon monoxide it forms a volatile complex nickel tetracarbonyl which on further heating at higher temperature decomposes to give pure nickle.

Ni+4CO 330−350k→−−−−−−−

Ni(CO)4 450−470k−→−−−−−−−

Ni+4CO

Answer 2

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CO is a reagant here use for reduction