If water is boiled for sometime, it becomes free from

Options

A. permanent hardness
B. temporary hardness
C. suspended matter
D. temporary hardness and dissolved gases

Explanation

To solve the question "If water is boiled for some time, it becomes free from," we need to analyze the different components of water that can be affected by boiling.

### Step-by-Step Solution:

1. **Understanding Hardness in Water**:
- Water can have two types of hardness: temporary and permanent.
- Temporary hardness is primarily due to the presence of calcium and magnesium bicarbonates, which can be removed by boiling.
- Permanent hardness, on the other hand, is due to sulfates and chlorides of calcium and magnesium, which cannot be removed by boiling.

2. **Effect of Boiling on Temporary Hardness**:
- When water is boiled, the heat causes calcium and magnesium bicarbonates to decompose into carbonates, which precipitate out of the solution.
- Therefore, boiling effectively removes temporary hardness from water.

3. **Suspended Matter**:
- Suspended matter refers to particles that are not dissolved in water, such as soil or other impurities.
- Boiling does not remove suspended matter; it remains in the water unless filtered out.

4. **Dissolved Gases**:
- Water can contain dissolved gases such as oxygen and carbon dioxide.
- According to Henry's Law, as the temperature of water increases (during boiling), the solubility of these gases decreases, causing them to escape from the water.

5. **Conclusion**:
- After boiling, water becomes free from temporary hardness (calcium and magnesium bicarbonates) and dissolved gases (like oxygen and carbon dioxide).
- Therefore, the correct answer to the question is that boiling water makes it free from **temporary hardness and dissolved gases**.

### Final Answer:
Boiling water makes it free from **temporary hardness and dissolved gases**.

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