In the equation,

$4 M + 8 C N^{-} + 2 H_{2} O + O_{2} ⟶ 4 [M (C N)_{2}]^{-} + 4 O H^{-}$
the metal M is:

Copper

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Silver

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Gold

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Zinc

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Solution

The correct options are
B Silver
C Gold
Cyanide process, also called Macarthur-Forrest Process, method of extracting silver and gold from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide.

The process was invented in 1887 by the Scottish chemists John S. MacArthur, Robert W. Forrest, and William Forrest.

$4 A g + 8 C N^{-} + 2 H_{2} O + O_{2} ⟶ 4 [A g (C N)_{2}]^{-} + 4 O H^{-}$
$4 A u + 8 C N^{-} + 2 H_{2} O + O_{2} ⟶ 4 [A u (C N)_{2}]^{-} + 4 O H^{-}$

Hence options B & C are correct.

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Similar questions

4 M + 8 C N^{-} + 2 H_{2} O + O_{2} \to 4 [M (C N)_{2}]^{-} + 4 O H^{-}

In the equation $4 M + 8 C N^{-} + 2 H_{2} O + O_{2} \to 4 [M (C N)_{2}] + 4 O H^{-}$
Identify metal M:

M + 8 C N^{-} + 2 H_{2} O + O_{2} \to 4 [M (C N)_{2}]^{-} + 4 O H^{-}

4 M + 8 C N^{-} + 2 H_{2} O + O_{2} \to 4 [M (C N)_{2}] + 4 O H^{-}

In the equation $4 M + 8 C N^{-} + 2 H_{2} O + O_{2} \to 4 [M (C N)_{2}] + 4 O H^{-}$
Identify metal M:

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