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Question

Complexes formed in the cyanide process are:


A
[Au(CN)2]
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B
[Ag(CN)2]
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C
[Au(CN)4]2
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D
[Zn(CN)4]2
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Solution

The correct options are
A [Au(CN)2]
B [Ag(CN)2]
D [Zn(CN)4]2
Siver is extracted from its ore - argentite (Ag2S), using the cyanide process. Reacting the ore with NaCN forms Na[Ag(CN)2]
AgS+4NaCN2Na[Ag(CN)2]+Na2S

Na[Ag(CN)2] combines with zinc dust to form Na2[Zn(CN)4]
Zn+2Na[Ag(CN)2]Na2[Zn(CN)4]+2Ag
Gold reacts with NaCN to form [Au(CN)2] :
4Au+8NaCN+O2+2H2O4Na[Au(CN)2]+4NaOH


Chemistry

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