Which of the following statements are correct about properties of colloids? I. A colloid is a homogeneous mixture. II. The size of particles of a colloid is too small to be individually seen by naked eye. III. Colloids are big enough to scatter a beam of light passing through it and make its path visible.

Options

A. I, II and III
B. II and III
C. I and II
D. I and III

Explanation

To determine which statements about the properties of colloids are correct, let's analyze each statement step by step.

### Step 1: Analyze Statement I
**Statement I:** A colloid is a homogeneous mixture.
- **Analysis:** This statement is incorrect. Colloids are actually heterogeneous mixtures, meaning that their components are not uniformly distributed. In colloids, the particles are mixed but remain distinct, leading to a non-uniform composition.

### Step 2: Analyze Statement II
**Statement II:** The size of particles of a colloid is too small to be individually seen by the naked eye.
- **Analysis:** This statement is correct. The particles in a colloid typically range in size from 1 nm to 1000 nm. Because of their small size, they cannot be seen individually without the aid of a microscope.

### Step 3: Analyze Statement III
**Statement III:** Colloids are big enough to scatter a beam of light passing through it and make its path visible.
- **Analysis:** This statement is also correct. Colloids can scatter light due to the size of their particles, which is a phenomenon known as the Tyndall effect. When light passes through a colloid, it is scattered, making the path of the light visible.

### Conclusion
Based on the analysis:
- Statement I is incorrect.
- Statement II is correct.
- Statement III is correct.

Thus, the correct statements about the properties of colloids are **Statement II and Statement III**.

### Final Answer
The correct statements are: **II and III only.**

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