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Q.

The formulae of the soluble complexes formed during the extraction of Ag and Au by the cyanide process respectively are

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a

NaAg(CN)2 and NaAu(CN)2

b

Na2AgS2O34 and HAuCl4

c

Na2AgCN4 and Na4Au6(CN)5

d

Na3Ag(CN)2 and Na2Au(CN)4

answer is A.

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Detailed Solution

Ag2S+4NaCN⇌2Na[Ag(CN)]+Na2S4Au+8KCN+2H2O+O2⟶4KAu(CN)2+4KOH
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