What is a true solution ?

Explanation

### Step-by-Step Text Solution:

1. **Definition of True Solution**: A true solution is a homogeneous mixture formed when a solute is completely dissolved in a solvent.

2. **Particle Size**: In a true solution, the size of the solute particles is less than 1 nanometer (1 nm). This small size allows the solute to remain evenly distributed throughout the solvent.

3. **Visibility**: True solutions are not visible to the naked eye, and even under a microscope, the solute particles cannot be seen. This is due to their extremely small size.

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