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Question

Which of the following solution shows Tyndall effect ?

A
Salt solution
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B
Milk
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C
Starch solution
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D
(b) and (c) above
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Solution

The correct option is D (b) and (c) above
Tyndall effect:
If a strong beam of ​light is passed​ through a colloidal sols placed in dark place,​ path of the beam ​gets illuminated. This effect is called Tyndall effect.
This effect was first observed ​by faraday later studied in ​detail by Tyndall​.
This effect arises due to scattering of light by colloidal​ particles in all directions . Thus, scattering of light illuminates the path of beam in the colloidal dispersion​.

It is used to distinguish between ​a colloidal and a true solution​.
True solution does not show Tyndall effect but colloidal solution shows​.

Salt solution and CuSO4 solutions are true solutions so they do not show Tyndall effect whereas milk and starch are colloidal solutions so they shows Tyndall effect.
​​

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