Chemistry
Nitrogen gas can be obtained by heating
- Ammonium nitrate
- Ammonium nitrite
- Magnesium nitride
- Ammonium chloride
Ammonia
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Answer
Ammonium nitrite
Reason — When ammonium nitrite (NH4NO2) is heated, it decomposes to form nitrogen gas (N2) and water vapour (H2O). This is a thermal decomposition reaction.
NH4NO2 N2 + 2H2O
The other substances do not furnish nitrogen gas on simple heating at laboratory temperatures:
- Ammonium nitrate mainly produces nitrous oxide (N2O) and water.
- Magnesium nitride does not decompose to N2; it yields ammonia when treated with water.
- Ammonium chloride sublimes rather than decomposes to nitrogen.
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