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In the purification of impoure Ni by Mon...

In the purification of impoure Ni by Mond's process, metal is puridied by

A

Electrolytic reduction

B

Vapour phase thermal decomposition

C

Thermite reduction

D

Carbon reduction.

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The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Mond's Process**: The Mond process is a method used to purify nickel. It involves the formation of a volatile nickel carbonyl compound. 2. **Formation of Nickel Carbonyl**: In this process, impure nickel is treated with carbon monoxide (CO) gas. The nickel reacts with CO to form nickel carbonyl (Ni(CO)4), which is a complex that has nickel in the zero oxidation state. 3. **Properties of Nickel Carbonyl**: The nickel carbonyl compound is highly volatile, which allows it to be separated from impurities that do not form such volatile compounds. 4. **Decomposition of Nickel Carbonyl**: The nickel carbonyl is then heated at a temperature between 300 to 700 degrees Celsius. During this heating, it decomposes back into pure nickel and carbon monoxide gas. 5. **Conclusion**: Since the purification of nickel in the Mond process involves the vapor phase thermal decomposition of nickel carbonyl, the correct answer to the question is option B: vapor phase thermal decomposition.
**Step-by-Step Solution:** 1. **Understanding Mond's Process**: The Mond process is a method used to purify nickel. It involves the formation of a volatile nickel carbonyl compound. 2. **Formation of Nickel Carbonyl**: In this process, impure nickel is treated with carbon monoxide (CO) gas. The nickel reacts with CO to form nickel carbonyl (Ni(CO)4), which is a complex that has nickel in the zero oxidation state. 3. **Properties of Nickel Carbonyl**: The nickel carbonyl compound is highly volatile, which allows it to be separated from impurities that do not form such volatile compounds. ...
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