During preparation of arene diazonium salts, the excess of nitrous acid, if any, is destroyed by adding?

a q . N a O H

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a q . N a_{2} C O_{3}

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a q . N H_{2} C O N H_{2}

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a q . K I

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Solution

The correct option is C $a q . N H_{2} C O N H_{2}$
Urea decomposes $H N O_{2}$ to give $N_{2}, C O_{2}$ and $H_{2} O$
$N H_{2} C O N H_{2} + 2 H O N O \to 2 N_{2} ↑ + C O_{2} ↑ + 3 H_{2} O$

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