Question

The chemical reagent used for leaching of gold and silver ores is

• A. Sodium hydroxide
• B. Potassium cyanide
• C. Potassium cyanate
• D. Sodium thiosulphate

Answer 1

Answer: (B)

Potassium cyanide

Answer 2

$Ag_{2}S+4KCN \to 2K[Ag(CN)_{2}]+K_{2}S$