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Question

In the equation, $$ 4M + 8CN^{-}+2H_2O +O_2 \rightarrow 4[M(CN)_2]^-+4OH^-$$. Identify the metal M.


A
Copper
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B
Iron
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C
Gold
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D
Zinc
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Solution

The correct option is C Gold
Least reactive metals like silver and gold are obtained by the cyanide process. In this process, the impure metal is treated with NaCN (solution) and the air is passed. Metal is converted into the soluble complex as

$$ 4Au+8CN^-+ 2H_2O + O_2 \rightarrow 4[Au(CN)_2]^-(soluble\ complex) + 4 OH^-$$ 

So, the correct option is $$C$$.

Chemistry

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