Question

Tyndall effect would be observed in:
A. Solution
B. Solvent
C. Precipitate
D. Colloidal solution

Answer 1

Hint: solution is a homogenous mixture of two or more substances. Solvent is a liquid in which another substance can be dissolved. Precipitate a solid substance that has been separated in a chemical process. Colloidal mixture has particles in which particles are not as small as solution and not large as suspension.

Complete Step by step answer: the tyndall effect is scattering of light by particles of very fine suspension. It is also called tyndall scattering. The intensity of scattered light is inversely proportional to the fourth power of its wavelength, therefore blue light scattered more than that of red light. Therefore the color of the sky appears to be blue.
Colloidal solution is the solution in which a mixture of insoluble particles are microscopically dispersed into another substance. The size of suspended particles should be in the range of 1-1000nm.
In colloidal solution particles should not be settled.
The tyndall effect is shown by colloidal solution in which particles of colloidal solution scatter the light falling on them.
The intensity of scattered light depends on the density of colloidal solution and wavelength of light that is falling on them.
When a beam of light falls on the particle of a colloidal solution, the particles do not allow the light to pass through them completely. The light beam falls on the particles and gets scattered. This scattering makes the path of the incident light visible.

So, the correct option is D, the tyndall effect is shown by colloidal solution.

Note: the particle size of solution is less than 1nm and particle size of suspension is more than 100nm , while the particle size of colloidal solution is in between them. The solution appears clear while both suspension and colloidal solution appear cloudy. Solution particles cannot be separated, colloidal particles can be separated and suspension particles separate.