Which of the following will not react with each other when heated together ?

Options

A. `BeO + MgO`
B. `Li_(2)CO_(3)+BeO`
C. `MgCO_(3)+Al_(2)O_(3)`
D. None of these

Explanation

To determine which of the given compounds will not react with each other when heated together, we need to analyze each pair of compounds. Let's go through the options step by step.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- The compounds given are:
- BeO (Beryllium Oxide)
- MgO (Magnesium Oxide)
- Li2CO3 (Lithium Carbonate)
- MgCO3 (Magnesium Carbonate)
- Al2O3 (Aluminum Oxide)
- NaNO3 (Sodium Nitrate)

2. **Analyze the Reactions:**
- **BeO + MgO:**
- When heated together, BeO and MgO react to form MgBeO2.
- **Conclusion:** They react.

- **Li2CO3 + BeO:**
- When heated, Li2CO3 reacts with BeO to form Li2BeO2 and releases CO2 gas.
- **Conclusion:** They react.

- **MgCO3 + Al2O3:**
- When heated, MgCO3 reacts with Al2O3 to produce MgAl2O4 and releases CO2 gas.
- **Conclusion:** They react.

- **NaNO3:**
- Sodium Nitrate (NaNO3) generally does not react with the other compounds listed when heated. It can decompose but does not form a compound with the oxides mentioned.
- **Conclusion:** It does not react with the other compounds.

3. **Final Conclusion:**
- Among the given options, the pair that does not react when heated together is NaNO3 with any of the other compounds listed. Therefore, the correct answer is:
- **D: None of these** (since all the other pairs react).