## Question

###### $left(mathrm{NH}_{4}ight)_{2} mathrm{CrO}_{7}$ on heating liberates a gas. The same gas will be obtained by(a) heating $mathrm{NH}_{4} mathrm{NO}_{2}$(b) heating $mathrm{NH}_{4} mathrm{NO}_{3}$(c) treating $mathrm{Mg}_{3} mathrm{~N}_{2}$ with $mathrm{H}_{2} mathrm{O}$(d) heating $mathrm{H}_{2} mathrm{O}_{2}$ on $mathrm{NaNO}_{2}$

$left(mathrm{NH}_{4} ight)_{2} mathrm{CrO}_{7}$ on heating liberates a gas. The same gas will be obtained by (a) heating $mathrm{NH}_{4} mathrm{NO}_{2}$ (b) heating $mathrm{NH}_{4} mathrm{NO}_{3}$ (c) treating $mathrm{Mg}_{3} mathrm{~N}_{2}$ with $mathrm{H}_{2} mathrm{O}$ (d) heating $mathrm{H}_{2} mathrm{O}_{2}$ on $mathrm{NaNO}_{2}$

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