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Electrolytic Refining

Native silver...

Question

Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of
(IIT-JEE, 2008)

A

Nitrogen

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B

Oxygen

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C

Carbon dioxide

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D

Argon

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Solution

The correct option is B Oxygen
Native silver metal forms a water soluble complex with a dilute aqueous solution of NaCN in the presence of oxygen as follows.
$4 A g + 8 N a C N + 2 H_{2} O + O_{2} \to 4 N a [A g (C N)_{2}] + 4 N a O H$

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