\( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) on heating liberates a gas...

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\( \left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \) 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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