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Consider the following about the Tyndall effect. (I) It is used to distinguish between a true and colloidal solution (II) It is possible only when the dispersed medium and dispersed phase differ much in their refractive indices (III) It is observed only when the size of colloidal particles is much smaller than the wavelength of the light used The correct statements are

Options

  1. AI & III only
  2. BII & III only
  3. CI, II & III
  4. DI & II only

Correct answer

D. I & II only

Step-by-step solution

Tyndall effect is observed in large-sized colloidal particles due to scattering of light by them. This happens when the size of the particles and the wavelength of the light are of similar magnitude. Thus, Statement (III) is incorrect while (I) and (II) are correct.

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