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NCERT Class XII Chemistry
Chapter - General Principle of Process of Isolation of Elements
Questions with Solutions

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Question : 12 of 31
Marks: +1, -0
Describe a method for refining nickel.
Solution:  
Nickel is purified by Mond’s process. Impure nickel is treated with carbon monoxide at 60-80°C when volatile compound nickel carbonyl is formed. Nickel carbonyl decomposes at 180°C to form pure nickel and carbon monoxide.
NiImpure+CO→60−80∘ CNi(CO)4Gaseous compound→180∘ CNiPure+4 CO\underset{\text{Impure}}{\mathrm{Ni}} + \mathrm{CO} \xrightarrow{60-80^{\circ}\,\mathrm{C}} \underset{\text{Gaseous compound}}{\mathrm{Ni}(\mathrm{CO})_4} \xrightarrow{180^{\circ}\,\mathrm{C}} \underset{\text{Pure}}{\mathrm{Ni}} + 4\,\mathrm{CO}
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