Silver is obtained from Na [Ag(CN)₂] by reaction with:

Cyanide process is carried out to obtain 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 → The pure metal is then obtained by reaction with zinc. The reaction is- 2 2 4 2Na[Ag(CN) ]+Zn Na [Zn(CN) ]+2Ag → Therefore, the correct answer is option (c) Zn. Extraction of Lead and Tin