The chemical reagent used for leaching of gold and silver ores is
-
sodium hydroxide
-
potassium cyanide
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sodium thiosulphate
-
sodium bicarbonate
-
none of these
B
Correct answer
Explanation
This option is correct because the leaching of gold means gold cyanidation of gold and for silver ores cyanidation of silver. Potassium cyanide (KCN) is used for extraction of gold and silver with respect to water to form soluble coordination complexes (K[Ag(CN)2], K[Au(CN)2]).