sodium peroxide which is a yellow solid, when exposed to air
becomes white due to the formation of:

Options

A. `H_(2)O_(2)`
B. `Na_(2)O`
C. `Na_(2)O` and `O_(3)`
D. `NaOH` and `Na_(2)CO_(3)`

Explanation

To solve the question regarding the color change of sodium peroxide when exposed to air, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Sodium Peroxide**: Sodium peroxide is represented by the chemical formula Na2O2. It is a yellow solid.

2. **Exposure to Air**: When sodium peroxide is exposed to air, it reacts with moisture (water vapor) present in the atmosphere.

3. **Reaction with Water**: The reaction of sodium peroxide with water can be represented as:
\[ \text{Na}_2\text{O}_2 + 2\text{H}_2\text{O} \rightarrow 2\text{NaOH} + \text{H}_2\text{O}_2 \]
This reaction produces sodium hydroxide (NaOH) and hydrogen peroxide (H2O2).

4. **Formation of Sodium Hydroxide**: Sodium hydroxide is a white crystalline solid. This contributes to the color change from yellow to white.

5. **Further Reaction with Carbon Dioxide**: Sodium hydroxide can further react with carbon dioxide (CO2) present in the air:
\[ 2\text{NaOH} + \text{CO}_2 \rightarrow \text{Na}_2\text{CO}_3 + \text{H}_2\text{O} \]
This reaction produces sodium carbonate (Na2CO3), which is also a white solid.

6. **Conclusion**: The yellow sodium peroxide becomes white due to the formation of sodium hydroxide and sodium carbonate when exposed to air.

### Final Answer:
Sodium peroxide becomes white due to the formation of sodium hydroxide (NaOH) and sodium carbonate (Na2CO3) when exposed to air.

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