In the extraction of gold, the cyanide solution acts as a
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a
leaching agent that dissolves the impurities
b
Flux
c
leaching agent that acts a complex forming reactant
d
reducing agent that converts the metal oxide or sulphide into the metal
answer is C.
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Detailed Solution
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+O2+2H2O→4K[Au(CN)2]Pot. dicyanoaurate(I)(soluble complex)+4KOH