NEET UG CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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In the equation,

4 \mathrm{M}+8 \mathrm{CN}^{-}+2 \mathrm{H}_2 \mathrm{O}+\mathrm{O}_2 \rightarrow 4\left[\mathrm{M}(\mathrm{CN})_2\right]^{-}+4 \mathrm{OH}^{-}

Identify the metal (M)

View answer and explanation

Correct option: A

\mathrm{Au}

Option A (

\mathrm{Au}

) is correct because gold is extracted by leaching with cyanide, forming a complex ion.

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