Question

Which of the following solutions will show
Tyndall effect?
i) River water
ii) Starch solution
iii) Muddy water iv) distilled water
A) i and ii
B) ii and iii
C) iv only
D) i, ii and iii​

Answer 1

Answer:

River water , Starch solution , Muddy water shows the Tyndall effect.

Explanation:

• It is the scattering of a beam of light by colloidal solution.
• Colloidal solution is a mixture in which microscopically dispersed insoluble particles  are suspended into the medium.
• The quantity of scattering is dependent upon light's frequency and particle density.
• Particles  which collides with each other and scattered the beam of light which generates the phenomenon of Tyndall effect.

Conditions:

Tyndall effect is observed when the following conditions are satisfied:

• The diameter of the dispersed particles should not much smaller than the wavelength of the light used for the operation.
• The values of refractive indices of the dispersed phase and the dispersion medium should differ.
• The size of the suspended particles in a colloid can range from 1 to 1000 nm.

A colloidal solution is a heterogeneous system consists of two phases in a medium.

Examples of Tyndall effect,

Sky is blue because of Tyndall effect, milk , starch solution, Ink , etc.

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Answer 2

Answer:

Option B) ii and iii will show Tyndall effect.

Tyndall Effect:

• The Tyndall effect can be defined as the scattering of light when a light beam passes through a colloid.
• The individual suspension particles scatter and reflect light, making the beam visible.
• As with Rayleigh scattering, blue light is scattered more compared to the red light by the Tyndall effect.

Explanation:

• Among the given solutions, starch solution and muddy water are colloidal solutions.
• River water and distilled water are not colloidal and hence will not scatter light.

Therefore, starch solution and muddy water will show the Tyndall effect.

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