Consider the following compounds :
(i) sulpher dioxide
(ii) hydrogen peroxide
(iii) ozone
Among these compounds, those which can act as bleaching agents would include :

Options

A. `1` and `3`
B. `2` and `3`
C. `1` and `3`
D. `1,2` and `3`

Answer

To determine which of the given compounds can act as bleaching agents, we will analyze each compound individually.

### Step 1: Analyze Sulfur Dioxide (SO₂)
- **Reaction**: Sulfur dioxide can act as a bleaching agent in the presence of moisture. The reaction can be represented as:
\[ \text{SO}_2 + 2\text{H}_2\text{O} \rightarrow 2\text{H}_2\text{SO}_4 + \text{nascent hydrogen} \]
- **Mechanism**: The nascent hydrogen produced in this reaction is responsible for bleaching colored materials. However, this bleaching effect is temporary because when the colorless matter comes into contact with atmospheric oxygen, the color can reappear.

### Step 2: Analyze Hydrogen Peroxide (H₂O₂)
- **Reaction**: Hydrogen peroxide also acts as a bleaching agent. The reaction can be represented as:
\[ \text{H}_2\text{O}_2 \rightarrow \text{H}_2\text{O} + \text{nascent oxygen} \]
- **Mechanism**: The nascent oxygen produced during the decomposition of hydrogen peroxide oxidizes the colored matter, converting it into colorless matter. This property makes hydrogen peroxide a common bleaching agent for materials like silk, ivory, wool, and feathers.

### Step 3: Analyze Ozone (O₃)
- **Reaction**: Ozone decomposes readily to produce nascent oxygen:
\[ \text{O}_3 \rightarrow \text{O}_2 + \text{nascent oxygen} \]
- **Mechanism**: Similar to the previous compounds, the nascent oxygen generated from ozone can bleach colored matter. Ozone is often used as a mild bleaching agent for oils, ivory, starch, floor wax, and delicate fabrics.

### Conclusion
Based on the analysis of the three compounds:
- **Sulfur Dioxide (SO₂)**: Acts as a bleaching agent.
- **Hydrogen Peroxide (H₂O₂)**: Acts as a bleaching agent.
- **Ozone (O₃)**: Acts as a bleaching agent.

Therefore, all three compounds can act as bleaching agents. The correct answer is:
**Option D: 1, 2, and 3.**