Which of the following ammonium salt will produce dinitrogen on heating?

(N H_{4})_{2} S O_{4}

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N H_{4} C l

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N H_{4} N O_{2}

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N H_{4} N O_{3}

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Solution

The correct option is C $N H_{4} N O_{2}$
Ammonium salts decompose quite readily on heating.
If the anion is not oxidising, ammonia is evolved.
$(N H_{4})_{2} S O_{4} (a q) \to 2 N H_{3} (g) + H_{2} S O_{4} (a q)$
$N H_{4} C l (a q) \to N H_{3} (g) + H C l (a q)$

If the anion is more oxidising, $N H_{4}$ is oxidised to $N_{2}$ or $N_{2} O$ .
$N H_{4} N O_{2} (a q) \to N_{2} (g) + 2 H_{2} O (l)$
$N H_{4} N O_{3} (a q) \to N_{2} O (g) + 2 H_{2} O (l)$

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Which of the following ammonium salt is not used on heating with alkalis to give ammonia?

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