A salt is warmed with $N a O H$ and the gas evolved gives dense white fumes with $H C l$ and also turns $H g_{2} (N O_{3})_{2}$ paper black. Name the gas.

Hydrogen sulphide

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Ammonia

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Oxygen

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Nitrogen

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Solution

The correct option is A Ammonia
Salt ammonium chloride; $N H_{4} C l$ reacts with NaOH to form ammonia as:
$N H_{4} C l + N a O H \to N a C l + H_{2} O + N H_{3}$

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