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Which one of the following will NOT show Tyndall effect ?

June 1, 2025 by rawan239

Which one of the following will NOT show Tyndall effect ?

Chalk powder freshly mixed with water

Lime juice

Few drops of milk mixed with water

Starch solution

This question was previously asked in

UPSC CAPF – 2019

Download PDF Attempt Online

The Tyndall effect is the scattering of light by colloidal particles in a colloid or a suspension. True solutions, where the solute particles are too small (individual ions or molecules) to scatter light significantly, do not exhibit the Tyndall effect. Among the given options, lime juice is primarily a true solution (containing dissolved sugars, citric acid, etc.), while chalk powder in water (suspension), milk in water (emulsion/colloid), and starch solution (colloid) contain particles large enough to scatter light.

– Tyndall effect is a phenomenon where light is scattered as it passes through a colloid or suspension.
– This scattering makes the path of the light beam visible.
– True solutions do not show the Tyndall effect because the dissolved particles are too small.

The Tyndall effect is a useful way to distinguish between a true solution and a colloid. If a beam of light passed through the mixture is visible, it is likely a colloid or suspension. If the beam is not visible, it is likely a true solution.

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