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ICSE Class 10 Chemistry Question 3 of 24

Solved 2023 Question Paper ICSE Class 10 Chemistry — Question 9

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9
Question

Question 1(ix)

The nitrate which on thermal decomposition leaves behind a residue which is yellow when hot and white when cold:

  1. Lead nitrate
  2. Ammonium nitrate
  3. Copper nitrate.
  4. Zinc nitrate
Answer

Zinc nitrate

Reason —

2Zn(NO3)2⟶2ZnO+4NO2+O2[Zinc[Zinc nitrate - white][Carboncarbonate][yellow - hot]dioxide][white][white - cold]\begin{matrix} 2\text{Zn(NO}_3)_2 &\longrightarrow & \text{2ZnO} & + & 4\text{NO}_2 &+ & \text{O}_2 \\ \text{[Zinc} & & \text{[Zinc nitrate - white]} & & \text{[Carbon} \\ \text{carbonate]} & & \text{[yellow - hot]} & & \text{dioxide]} \\ \text{[white]} & & \text{[white - cold]} \end{matrix}

Zinc nitrate decomposes to produces zinc oxide, which is yellow when hot and white when cold