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${(N H_{4})}_{2} C r_{2} O_{7}$ on heating liberates a gas. The same gas will be obtained by

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heating $N H_{4} N O_{3}$

heating $N H_{4} N O_{2}$

treating $H_{2} O_{2}$ with $N a N O_{2}$

treating $M g_{3} N_{2}$ with $H_{2} O$

answer is B.

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Detailed Solution

Here nitrogen gas is formed in both the processes as follows
${(N H_{4})}_{2} C r_{2} O_{7} \overset{Δ}{\to} N_{2} + C r_{2} O_{3} + 4 H_{2} O N H_{4} N O_{2} \overset{Δ}{\to} N_{2} + 2 H_{2} O$

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