Question

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

A
Copper
B
Iron
C
Gold
D
Zinc

Solution

## The correct option is C GoldLeast 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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