Question

Cyanide process is used for the extraction of which of the following metals?

• A. Cr
• B. Ag
• C. Cu
• D. Zn

Hint:

Cyanide process is mainly applied to gold and silver ores.

Answer 1

The Correct Option is B

Step 1: Recall cyanide process.
Cyanide process (MacArthur-Forrest process) is used for the extraction of gold (Au) and silver (Ag) from their low-grade ores.
Step 2: Check given options.
- Cr: not extracted by cyanide method.
- Ag: correct, silver is extracted by leaching with NaCN or KCN solution.
- Cu: not by cyanide process, usually by hydrometallurgy or smelting.
- Zn: extracted mainly by roasting and reduction.
Step 3: Conclusion.
Therefore, cyanide process is used for the extraction of Silver (Ag).