Question

If a beam of light is passed through true solution, it is

• A. visible
• B. scatter
• C. not visible
• D. None of the above

Answer 1

The Correct Option is C

To understand whether the beam of light is visible when passed through a true solution, we need to explore the concept of the Tyndall effect and the nature of different solutions.

Understanding True Solution

A true solution is a homogeneous mixture where the solute particles are completely dissolved in the solvent. The particles in a true solution are typically very small, usually less than 1 nanometer in diameter. Due to their small size, they do not scatter light.

The Tyndall Effect

The Tyndall effect is the scattering of light as it passes through a colloid or a fine suspension. This effect causes the path of light to become visible, and it is a common way to distinguish between a colloid and a true solution. In true solutions, the particles are too small to cause scattering, so the Tyndall effect is not observed.

Conclusion

For the given question:

• Visible: Not applicable for true solutions because they do not scatter light.
• Scatter: True solutions do not scatter light; hence, this option is incorrect.
• Not visible: This is the correct answer. True solutions do not scatter light, making the light beam not visible.
• None of the above: Since "not visible" is correct, this option is incorrect.

Therefore, the correct answer is that when a beam of light is passed through a true solution, it is not visible.