Pigments of natural colours can be separated by

Options

A. chromatography
B. centrifugation
C. filtration
D. sublimation

Explanation

To answer the question "Pigments of natural colours can be separated by," we will follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the method used to separate natural color pigments.

**Hint**: Think about techniques used in chemistry for separation based on physical properties.

2. **Identifying Separation Techniques**: There are various methods for separating substances, including chromatography, centrifugation, and filtration.

**Hint**: Recall the characteristics of each separation technique.

3. **Analyzing Chromatography**: Chromatography is a technique that separates substances based on their different rates of movement through a medium (like paper) due to absorption and capillarity.

**Hint**: Consider how substances interact with the medium and how this affects their movement.

4. **Describing the Process**: In chromatography, pigments are placed on a paper, and as a solvent moves up the paper, different pigments are absorbed at different rates, resulting in distinct colored streaks.

**Hint**: Visualize the process of how pigments travel up the paper and how they appear.

5. **Evaluating Other Techniques**:
- **Centrifugation**: This method separates substances based on density by spinning them, which is not suitable for separating pigments in this context.
- **Filtration**: This method removes solid particles from liquids or gases using a filter, which does not apply to the separation of pigments.

**Hint**: Compare the principles of each technique to the nature of the pigments.

6. **Conclusion**: The correct method for separating pigments of natural colors is chromatography.

**Final Answer**: Pigments of natural colours can be separated by **chromatography**.