In the extraction of silver, Ag2S is dissolved in: (AIPMT 2009)

Cyanide process is carried out to extract less reactive metals like gold and silver. The impure metal is treated with NaCN solution in presence of air. The metal then forms a soluble complex. The reaction is- 2 2 2 Ag S+4NaCN 2Na[Ag(CN) ]+Na S -> However, instead of NaCN, KCN is also used to form 2 [ ( ) ] K Ag CN Therefore, the correct answer is option (c) KCN.