Question

Name the following:
1. A carbonate which do not decompose on heating.
2. A nitrate which produces oxygen as only gas.
3. A compound which produces carbon dioxide on heating
4. A nitrate which produces Brown gas on heating.

Answer 1

1. Sodium carbonate, potassium carbonate
2. potassium or sodium nitrate
3. Calcium Carbonate
4. Lead Nitrate

Answer 2

1. A carbonate, which does not decomposes on heating: Sodium Carbonate and Potassium Carbonate.
2. A nitrate, which produces oxygen as the only gas: Sodium Nitrate and Potassium Nitrate.
3. A compound that produces carbon dioxide on heating: Calcium Carbonate.
4. A nitrate, which produces Brown gas on heating: Lead Nitrate

Explanation:

All of the above cases demonstrate the exceptional behavior of the compounds.

1. In the first instance, we came to know that Sodium and Potassium Carbonate do not decompose on heating, this is because they are heat stable.
2. In Second, it is an isothermal reaction and produces oxygen on decomposition of nitrate.
3. The heating of calcium carbonate chemical reaction is as follows, $\mathrm{CaCO}_{3} \rightarrow \mathrm{CaO}+\mathrm{CO}_{2}$
4. The reaction which involves heating on lead nitrate is as follows: $2 \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}=2 \mathrm{PbO}+4 \mathrm{NO}_{2}+\mathrm{O}_{2}$. In this reaction $NO_2$ gas liberated is in brown color.