When two liquids in a mixture differ by their boiling points. Which of the following is the best method to separate these liquids?

Options

A. Evaporation
B. Distillation
C. Chromatography
D. Filtration

Explanation

To solve the question of how to separate two liquids in a mixture that differ by their boiling points, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Properties of the Mixture**:
- We have a mixture of two liquids.
- The key property we are focusing on is the difference in their boiling points.

2. **Understand the Methods of Separation**:
- **Evaporation**: This method is typically used to separate a solute from a solvent (like salt from water) and is not suitable for separating two liquids.
- **Distillation**: This method is effective for separating liquids based on their boiling points. It works best when the boiling points differ significantly (at least 25-30 Kelvin).
- **Chromatography**: This technique is used primarily for separating different components of a mixture based on their movement through a medium, often used for colored substances.
- **Filtration**: This method is used to separate solids from liquids or gases, and is not suitable for separating two liquids.

3. **Evaluate the Best Method**:
- Since the question specifies that the two liquids have different boiling points, the most appropriate method for separation is distillation.
- Distillation allows for the collection of vapors from the liquid with the lower boiling point, which can then be condensed back into a liquid, effectively separating it from the other liquid.

4. **Conclusion**:
- The best method to separate two liquids in a mixture that differ by their boiling points is **distillation**.

### Final Answer:
- The correct answer is **Option B: Distillation**.