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Following reactions take place during ex...

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

A

oxidising agent

B

Reducing agent

C

Both

D

Base

Text Solution

Verified by Experts

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

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