How many compounds liberate \( \mathrm{NH}_{3} \) on heating from the following? \[ \left(\mathr...

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How many compounds liberate \( \mathrm{NH}_{3} \) on heating from the following?
\[
\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3}, \mathrm{NH}_{4} \mathrm{Cl}, \mathrm{NH}_{4} \mathrm{NO}_{3},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}
\]
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