1.

In the extraction of gold, the cyanide solution acts as aA. leaching agent that dissolves the impuritiesB. FluxC. leaching agent that acts a complex forming reactantD. reducing agent that converts the metal oxide or sulphide into the metal

Answer» Correct Answer - C
When the gold pass into the solution of sodium or potassium cyanide forming the respective soluble complex cyanides while the impurities remain unaffected which are filtered off.
`4Au+8KCN+O_(2)+2H_(2)Orarr underset("Pot.dicyanoaurate(I) (solubl e compl ex"))(4K[Au(CN)_(2)]+4KOH`


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