Soap solution used for cleaning purpose appears cloudy. This is due to

Soap solution used for cleaning purpose appears cloudy. This is due to the fact that soap micelles can

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refract light

scatter light

diffract light

polarize light

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UPSC CDS-2 – 2019

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Soap solutions, when used for cleaning, form micelles. Micelles are aggregates of soap molecules that are dispersed throughout the water. These aggregates are large enough (typically in the colloidal size range) to scatter light that passes through the solution. This scattering of light, known as the Tyndall effect, makes the solution appear cloudy or opaque.

The cloudy appearance of soap solution is due to the scattering of light by soap micelles (Tyndall effect).

Scattering of light is a characteristic property of colloidal solutions, suspensions, and emulsions, where dispersed particles are larger than the wavelength of light, unlike true solutions where solute particles are too small to scatter visible light.

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