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Question
Why is the Tyndall effect exhibited by colloidal solutions but not by true solutions?
Short Answer
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Solution
The Tyndall effect is exhibited by colloidal solutions because their particles are of a size comparable to the wavelength of visible light, allowing them to scatter light. In contrast, true solutions contain particles (ions or molecules) that are too small to scatter light effectively. Hence, light passes through true solutions without scattering, and they do not show the Tyndall effect. This difference allows the Tyndall effect to distinguish colloidal solutions from true solutions.
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