Which of the following compound gives paramagnetic gas on heating :-

Options

A. `LiNO_(3)`
B. `NaNO_(3)`
C. `KNO_(3)`
D. All of these

Answer

To determine which of the given compounds produces a paramagnetic gas upon heating, we need to identify the compounds that release oxygen gas (O2) when heated. Oxygen is considered a paramagnetic gas because it has unpaired electrons, which allows it to be attracted to a magnetic field.

### Step-by-Step Solution:

1. **Identify the Compounds**: We need to analyze the given compounds to see which ones can release oxygen gas when heated.

2. **Analyze Lithium Nitrate (LiNO3)**:
- When lithium nitrate is heated, it decomposes according to the reaction:
\[ 2 \text{LiNO}_3 \rightarrow \text{Li}_2\text{O} + 2 \text{NO}_2 + \text{O}_2 \]
- This reaction shows that oxygen gas (O2) is produced.

3. **Analyze Sodium Nitrate (NaNO3)**:
- Upon heating, sodium nitrate decomposes as follows:
\[ 2 \text{NaNO}_3 \rightarrow 2 \text{NaNO}_2 + \text{O}_2 \]
- Here, oxygen gas (O2) is also released.

4. **Analyze Sodium Nitrate (NaNO3)**:
- When sodium nitrate is heated, it decomposes to:
\[ 2 \text{NaNO}_3 \rightarrow \text{Na}_2\text{O} + 2 \text{NO}_2 + \text{O}_2 \]
- This reaction also produces oxygen gas (O2).

5. **Conclusion**: All three compounds (LiNO3, NaNO3, and NaO3) produce oxygen gas when heated. Since oxygen is a paramagnetic gas, all three compounds will give a paramagnetic gas upon heating.

### Final Answer:
All of the compounds listed (LiNO3, NaNO3, and NaO3) give paramagnetic gas (O2) on heating.