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The compound(s) that produces nitrogen gas by thermal decomposition is/are
$$\text{NH}_4\text{NO}_2 \rightarrow \text{N}_2 + 2\text{H}_2\text{O}$$ and $$(\text{NH}_4)_2\text{Cr}_2\text{O}_7 \rightarrow \text{N}_2 + \text{Cr}_2\text{O}_3 + 4\text{H}_2\text{O}$$ both give nitrogen. $$(\text{NH}_4)_2\text{SO}_4$$ gives ammonia, and $$\text{NH}_4\text{NO}_3$$ gives nitrous oxide, $$\text{N}_2\text{O}$$. Hence options a and c are correct.
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