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Question

M+8CN+2H2O+O24[M(CN)2]+4OH
metal M is:

A
Cu
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B
Hg
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C
Ag
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D
Au
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Solution

The correct option is C Au
The above reaction is Mac Arthur-Forrest process.
It is a hydometallurgieal technique for attraction of Gold.
It conuier to the gold are to a water couble coordination complex and further gold is recovered by more reactive time or any other metal
Reaction invilved:
4Au(s)+8CN+2H2O+O2water soluble coordinate complex4[Au(CN)2]+4OH
metal M Gold


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