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(D) The Tyndall effect is the scattering of light by colloidal particles.Statement $(I)$ is correct: It is a standard method to distinguish between a

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$I$ and $II$ only

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(D) The Tyndall effect is the scattering of light by colloidal particles.Statement $(I)$ is correct: It is a standard method to distinguish between a true solution (which does not show the effect) and a colloidal solution (which does).Statement $(II)$ is correct: The scattering of light depends on the difference in refractive indices between the dispersed phase and the dispersion medium.Statement $(III)$ is incorrect: The Tyndall effect is observed when the diameter of the dispersed particles is not much smaller than the wavelength of the light used; if particles are too small,they do not scatter light effectively.Therefore,statements $(I)$ and $(II)$ are correct.

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