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Ores and Minerals

The reaction ...

Question

The reaction between metallic silver and aqueous NaCN forming a soluble complex occurs in the presence of :

A

Nitrogen

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B

Helium

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C

Argon

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D

Oxygen

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Solution

The correct option is D Oxygen
$4 A g (s) + 8 C N^{-} (a q) + 2 H_{2} O (a q) + O_{2} (g) \to 4 [A g (C N)_{2}]^{-} (a q) + 4 O H^{-} (a q)$

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Q. Assertion :Extraction of gold from its native ore involves leaching the metal ore with dilute solution of NaCN in presence of air. Reason: This is an oxidation reaction and leads to the formation of a soluble complex.

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