Mark the gas which turns lime water milky

Options

A. `H_(2)S`
B. `SO_(2)`
C. `Cl_(2)`
D. `CO_(2)`

Explanation

To solve the question of which gas turns lime water milky, we can follow these steps:

### Step-by-Step Solution:

1. **Identify Lime Water**:
- Lime water is a dilute solution of calcium hydroxide (Ca(OH)₂).

2. **Understand the Reaction**:
- When certain gases are bubbled through lime water, they react with calcium hydroxide to form precipitates that cause the solution to turn milky.

3. **Consider Carbon Dioxide (CO₂)**:
- When carbon dioxide is introduced to lime water, it reacts as follows:
\[ \text{Ca(OH)}_2 + \text{CO}_2 \rightarrow \text{CaCO}_3 \downarrow + \text{H}_2\text{O} \]
- Calcium carbonate (CaCO₃) is formed, which is insoluble in water and precipitates out, causing the solution to appear milky.

4. **Consider Sulfur Dioxide (SO₂)**:
- When sulfur dioxide is introduced to lime water, it reacts as follows:
\[ \text{Ca(OH)}_2 + \text{SO}_2 \rightarrow \text{CaSO}_3 \downarrow + \text{H}_2\text{O} \]
- Calcium sulfite (CaSO₃) is formed, which is also insoluble and causes the solution to turn milky.

5. **Conclusion**:
- Both carbon dioxide (CO₂) and sulfur dioxide (SO₂) can turn lime water milky. Therefore, the gases that can be marked are CO₂ and SO₂.

### Final Answer:
The gases which turn lime water milky are **Carbon Dioxide (CO₂)** and **Sulfur Dioxide (SO₂)**.

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