Question

Which statement is incorrect about Tyndall effect?

A)True solution show Tyndall effect B)Suspensions show Tyndall effect

C)Colloid show Tyndall effect D)Both B and C show Tyndall effect
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Answer 1

Answer:

The particle size is very small in true solutions, it's not in the colloidal range, it's smaller than the colloidal range. True solutions therefore do not exhibit Tyndall influence, as the particle is not large enough to disperse the light incident on it. So, the correct answer is “Option B”.

Explanation:

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Answer 2

The incorrect statement about Tyndall effect is: True solution show Tyndall effect.

• When intense converging beam of light is passed through a colloidal solution kept in dark, the path of the beam gets illuminated with a bluish light. This phenomenon is called Tyndall effect.
• The Tyndall effect is due to the scattering of light by colloidal particles.
• Since the dimensions of colloidal particles are comparable to the wavelength of ultraviolet and visible radiations, they scatter these radiations and get illuminated.
• Tyndall effect is not exhibited by true solutions because the particles present in a true solution are too small to scatter light.
• Suspensions, however, have particles that are large enough to scatter light.