Following reaction is reversible
$A g_{2} S + 4 N a C N ⇌ 2 N a [A g (C N)_{2}] + N a_{2} S$
When we pass air this reaction become spontaneous.

True

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False

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Solution

The correct option is A True
$A g_{2} S + 4 N a C N ⇋ 2 N a [A g (C N)_{2}] + N a_{2} S$
Silver is extracted from the ore-argentite ( $A g_{2} S$ ). The process of extraction of silver is called as cyanide process as sodium cyanide solution is used. The ore is crushed, concentrated and then treated with sodium cyanide solution and then the silver obtained is purified by the electrolytic process. When we pass air this reaction become spontaneous.

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A g_{2} S

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