Question

The reaction representing the Mond process for metal refining is _________.

• A. \(2\text{K[Au(CN)}_2] + \text{Zn} \xrightarrow{\Delta} \text{K}_2[\text{Zn(CN)}_4] + 2\text{Au}\)
• B. \(\text{Ni} + 4\text{CO} \xrightarrow{\Delta} \text{Ni(CO)}_4\)
• C. \(\text{Zr} + 2\text{I}_2 \xrightarrow{\Delta} \text{ZrI}_4\)
• D. \(\text{ZnO} + \text{C} \xrightarrow{\Delta} \text{Zn} + \text{CO}\)

Hint:

For refining processes:
• Mond process is specific to nickel and involves the formation of a volatile carbonyl compound.
• Identify the reactions forming volatile compounds for easy separation and purification.

Answer 1

The Correct Option is B

- The Mond process is used for refining nickel. In this process, impure nickel reacts with carbon monoxide at moderate temperatures to form volatile nickel tetracarbonyl \(\text{Ni(CO)}_4\).
The reaction is:
\[\text{Ni} + 4\text{CO} \xrightarrow{\Delta} \text{Ni(CO)}_4.\]
- The volatile \(\text{Ni(CO)}_4\) is then decomposed at high temperatures to obtain pure nickel.
Final Answer: (1) \(\text{Ni} + 4\text{CO} \xrightarrow{\Delta} \text{Ni(CO)}_4\).