Question

What is role of co in the purification of Ni??

Answer 1

Role of co in the purification of Ni is that CO forms a volatile compound with Ni, 


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Answer 2

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Here is your answer

The Mond process, sometimes known as the carbonyl process, is a technique created by Ludwig Mond in 1890,[1] to extract and purify nickel. The process was used commercially before the end of the 19th century.[2] This process converts nickel oxides into pure nickel.

This process involves the fact that carbon monoxide combines with nickel readily and reversibly to give nickel carbonyl. No other element forms a carbonyl compound under the mild conditions used in the process.[citation needed]

This process has three steps:

1. Nickel oxide reacts with Syngas at 200 °C to give nickel, together with impurities including iron and cobalt.

NiO(s) + H2(g) → Ni(s) + H2O(g)

2. The impure nickel reacts with carbon monoxide at 50–60 °C to form the gas nickel carbonyl, leaving the impurities as solids.

Ni(s) + 4 CO(g) → Ni(CO)4(g)

3. The mixture of nickel carbonyl and Syngas is heated to 220–250 °C, resulting in decomposition back to nickel and carbon monoxide:

Ni(CO)4(g) → Ni(s) + 4 CO(g)

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