ICSE Class 9 Chemistry Question 12 of 18

Chemical Changes and Reactions — Question 2

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2
Question

Question 1(ii)

Heating of zinc nitrate is a ............... reaction.

  1. Displacement
  2. Combination
  3. Decomposition
  4. Redox
Answer

Decomposition reaction

Reason — Zinc nitrate undergoes thermal decomposition and produces reddish brown Nitrogen dioxide gas (NO2), Zinc oxide (ZnO), and Oxygen gas (O2).

Zn(NO3)2Δ4NO2+2ZnO+O2\text{Zn}(\text{NO}_3)_2 \xrightarrow{\Delta} \text{4NO}_2 + \text{2ZnO} + \text{O}_2 ↑