Identify the correct statement(s):

Options

A. Sodium carbonate on heating evolves carbon dioxide
B. Sodium nitrate on heating evolves nitrogen dioxide
C. Sodium hydroxide does not decompose on heating
D. Sodium bicarbonate on heating evolve carbon dioxide

Answer

To solve the question of identifying the correct statements regarding the behavior of certain sodium compounds upon heating, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Option 1: Sodium Carbonate on Heating Evolves Carbon Dioxide**
- Sodium carbonate (Na2CO3) does not evolve carbon dioxide upon heating. Instead, it loses its water of crystallization when heated, forming anhydrous sodium carbonate (Na2CO3). Therefore, this statement is **false**.

2. **Option 2: Sodium Nitrate on Heating Evolves Nitrogen Dioxide**
- When sodium nitrate (NaNO3) is heated, it decomposes to form sodium nitrite (NaNO2) and oxygen gas (O2), not nitrogen dioxide (NO2). Thus, this statement is also **false**.

3. **Option 3: Sodium Hydroxide Does Not Decompose on Heating**
- Sodium hydroxide (NaOH) is thermally stable and does not decompose upon heating. Therefore, this statement is **true**.

4. **Option 4: Sodium Bicarbonate on Heating Evolves Carbon Dioxide**
- Sodium bicarbonate (NaHCO3) decomposes upon heating to produce sodium carbonate (Na2CO3), water (H2O), and carbon dioxide (CO2). Thus, this statement is **true**.

### Conclusion:
From the analysis, we find that:
- **Option 1**: False
- **Option 2**: False
- **Option 3**: True
- **Option 4**: True

The correct statements are **Option 3 and Option 4**.