Cyanide process is used for the extraction of

• Isolation Metals

Cyanide process is used for the extraction of

1. barium
2. aluminium
3. silver
4. boron

Answer

Cyanide process is used for the extraction of silver. Silver is extracted from the Argentite ore (Ag₂S). The process of extraction of silver is called as cyanide process as sodium cyanide solution is used. 

The argentite ore dissolves in sodium cyanide forming sodium argento cyanide.

Ag₂S + 2NaCN → Na[Ag(CN)₂] + Na₂S

The correct option is C.