The compound(s) which generate(s) $N_{2}$ gas upon thermal decomposition below $300^{o} C$ is (are):

N H_{4} N O_{3}

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(N H_{4})_{2} C r_{2} O_{7}

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B a (N_{3})_{2}

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M g_{3} N_{2}

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Solution

The correct option is C $B a (N_{3})_{2}$
(a) $N H_{4} N O_{3} △ \to N_{2} O + 2 H_{2} O (N_{2} O$ can further decompose to $N_{2})$ and $O_{2}$ at temperature above $300^{o} C)$
(b) $(N H_{4})_{2} C r_{2} O_{7} △ \to N_{2} + C r_{2} O_{3} + 4 H_{2} O$
(c) $B a (N_{3})_{2} △ \to 3 N_{2} + B a$
(d) $M g_{3} N_{2}$ does not decompose at any temperature.

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