Question

Suspension shows tyndall effect because of

• A. the small size of particles
• B. large size of particles
• C. their settling down nature
• D. none of the above

Answer 1

The correct option is B

large size of particles

The explanation for the correct option:

Option (B): large size of particles

1. A suspension is a heterogeneous combination in which solid particles are distributed throughout the liquid but do not dissolve in it.
2. In a suspension, the size of the solute particles is quite large, hence suspension's particles are easily visible.
3. Also these particles do not pass through a filter paper. Filtration can thus be used to separate a suspension.
4. The suspension is unstable. After some time, the particles of a suspension settle down.
5. Suspension exhibits the Tyndall effect due to the large particle size.
6. When a beam of light passes through a colloidal solution with constituent particles of equal size to the wavelength of the light beam, the beam is scattered in such a way that its route or trajectory is visible. The Tyndall effect is a phenomenon in which light scatters and makes its path apparent.
7. The large particles of suspension scatter light rays, and the ray's path is visible through the suspension.
8. Hence, it is the correct option.

The explanation for the incorrect options:

Option (A): the small size of particles

1. A suspension is a heterogeneous combination in which solid particles are distributed throughout the liquid but do not dissolve in it.
2. In a suspension, the size of the solute particles is quite large, hence suspension's particles are easily visible.
3. Hence, it is an incorrect option.

Option (C): their settling down nature.

1. The Tyndall effect is a phenomenon in which light scatters and makes its path apparent. The large particles of suspension scatter light rays, and the ray's path is visible through the suspension.
2. Hence, it is an incorrect option.

Therefore, Suspension shows the Tyndall effect because of the large size of the particles.