Question

From the following list of substances. choose one substance in each case which matches the description given below :

Ammonium nitrate, calcium hydrogen carbonate, copper carbonate, lead nitrate, potassium nitrate, sodium carbonate, sodium hydrogen carbonate. zinc carbonate.

A nitrate which gives off only oxygen when heated.

A nitrate which on heating decomposes into dinitrogen oxide [nitrous oxide] and steam.

A nitrate which gives off oxygen and nitrogen dioxide when heated.

Answer 1

1. The salts which have ion of $\left(N{O}_3^{-}\right)$ are known as Nitrates.
2. Few examples are Potassium nitrate $\left(KN{O}_3\right)$, Ammonium nitrate $\left(N{H}_{4}N{O}_3\right)$, Copper nitrate $\left(Cu{\left(N{O}_3\right)}_2\right)$

The suitable Nitrates-

1. Potassium nitrate $\left(KN{O}_3\right)$gives only oxygen on heating
2. $$\begin{gathered} 2KN{O}_3\stackrel{∆}{\left(s\right)\to }2KN{O}_2\left(s\right)+O_2\left(g\right) \\ PotassiumPotassiumOxygen \\ nitratenitrite \end{gathered}$$
3. Ammonium nitrate $\left(N{H}_{4}N{O}_3\right)$gives Nitrous oxide $\left(N_{2}O\right)$ and steam $\left(H_{2}O\right)$ on heating.
4. $$\begin{gathered} N{H}_{4}N{O}_3\left(s\right)\stackrel{∆}{\to }{N}_{2}O\left(g\right)+2H_{2}O\left(g\right) \\ AmmoniumNitrousSteam \\ nitrateoxide \end{gathered}$$
5. Copper nitrate $\left(Cu{\left(N{O}_3\right)}_2\right)$ gives Oxygen $\left(O_2\right)$ and Nitrogen dioxide$\left(N{O}_2\right)$
6. $$\begin{gathered} 2{Cu\left(N{O}_3\right)}_2\left(s\right)\stackrel{∆}{\to }2CuO\left(s\right)+4N{O}_2\left(g\right)+O_2\left(g\right) \\ CopperCopperNitrogenOxygen \\ nitrateoxidedioxide \end{gathered}$$