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In the equation: M+8CN^(-)+2H(2)O+O(2)...

In the equation:
`M+8CN^(-)+2H_(2)O+O_(2)to4[M(CN)_(2)]^(-)+4OH^(-)` metal M is:

A

Copper

B

Gold

C

Zinc

D

Iron

Text Solution

Verified by Experts

The correct Answer is:
B
The reaction is leaching of Au and Ag.
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Following reactions take place during extraction of gold 4Au+8CN^(-)+ 2H_(2)O + O_(2) to 4[Au(CN)_(2)]^(-)+ 4OH^(-) 2[Au(CN)_(2)]^(-) + Zn to 2Au + [Zn(CN)_(4)]^(2-) Zinc in the extraction of gold acts as a/an

Name the metal M which is extracted on the basis of following reactions : 4M + 8CN^(-)+2H_(2)O+O_(2) rarr 4[M(CN)_(2)]^(-)+4OH^(-) 2[M(CN)_(2)]^(-)+Zn rarr [Zn(CN)_(4)]^(2-)+ 2M

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