Q8 / 90 · JEE Main 2023 (13 Apr Shift 2) · Chemistry

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : The diameter of colloidal particles in solution should not be much smaller than wavelength of light to show Tyndall effect.

Reason R : The light scatters in all directions when the size of particles is large enough.

In the light of the above statements, choose the correct answer from the options given below :

  • A
    Both A and R are correct but R is NOT the correct explanation of A
  • B
    A is true but R is false
  • C
    A is false but R is true
  • Correct answer
    D
    Both A and R are correct and R is the correct explanation of A

Solution

Conditions for Tyndall effect:

(i) Diameter of colloidal particles in solution is not much smaller than wavelength of the light used.

(ii) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude. If size of particles is large enough than light scatters in all directions.

So Both A and R are correct and R is the correct explanation of A.

Hence, the correct answer is option: 'D'.

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