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ICSE Class 10 Chemistry Question 4 of 23

Model Paper 1 — Question 9

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Question 1(ix)

Nitrogen gas can be obtained by heating

  1. Ammonium nitrate
  2. Ammonium nitrite
  3. Magnesium nitride
  4. Ammonium chloride
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 →Δ\xrightarrow{\Delta} 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.