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JEE Main · 2020 · 03 Sep 2020 · Shift 1 · Surface Chemistry

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Tyndall effect is observed when
  1. (A)The diameter of dispersed particles is similar to the wavelength of light used.✓ Correct
  2. (B)The diameter of dispersed particles is much larger than the wavelength of light used.
  3. (C)The refractive index of dispersed phase is greater than that of the dispersion medium.
  4. (D)The diameter of dispersed particles is much smaller than the wavelength of light used.

Answer: (A)

Solution

The Tyndall effect is the scattering of a light beam by the dispersed particles of a colloid, and it is seen when those particles have diameters comparable to the wavelength of the light used. Particles much smaller scatter too feebly, and much larger ones no longer form a colloid, so the condition is that the particle diameter be similar to the wavelength of the light.

JEE Main · 2020 · 03 Sep 2020 · Shift 1 · Single correct option

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