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Electrolytic Refining

Native silver...

Question

Native silver metal forms a water soluble complex with a dilute aqueous solution of $N a C N$ in the presence of:

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
$A g$ reacts in a solution of $N a C N$ in the presence of air and forms sodium argentocyanide.

$4 A g + 8 N a C N + 2 H_{2} O + O_{2} \to 4 N a [A g (C N)_{2}] + 4 N a O H$

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