Impurities in water

Options

A. decreases BP of water
B. Increases BP of water
C. increases freezing point
D. None of these

Answer

**Step-by-Step Solution:**

1. **Understanding Impurities in Water:**
- Impurities are substances that are not water and can be dissolved in it or suspended in it. Common impurities include salts, minerals, and organic matter.

2. **Effect of Impurities on Boiling Point:**
- When impurities are added to water, they affect its physical properties. One significant effect is on the boiling point of water.

3. **Boiling Point Elevation:**
- The presence of impurities in water leads to a phenomenon known as boiling point elevation. This means that the boiling point of the water increases when impurities are present.

4. **Reasoning Behind Boiling Point Elevation:**
- The reason for this increase is that impurities disrupt the formation of vapor bubbles in the liquid. This means that more energy (heat) is required to allow the water molecules to escape into the vapor phase.

5. **Conclusion:**
- Based on the above reasoning, we can conclude that the correct answer to the question about the effect of impurities in water is option B: impurities increase the boiling point of water.