Identify the incorrect statement :
- Values of colligative properties of colloidal solution are of small order compared to values of true solution
- Tyndall effect is observed only when diameter of the dispersed particles is not much smaller than wavelength of incident light
- Colour of colloidal solution depends on the wavelength of light scattered by the dispersed particles
- Brownian movement is due to balanced bombardment of molecules of dispersion medium on colloidal particles
The Correct Option is D
Solution and Explanation
(A) Values of colligative properties of colloidal solution are of small order compared to values of true solution:
This statement is correct. Colligative properties depend on the number of particles in the solution, and colloidal solutions have fewer particles than true solutions, so the colligative properties of colloidal solutions are indeed smaller than those of true solutions.
(B) Tyndall effect is observed only when the diameter of the dispersed particles is not much smaller than the wavelength of incident light:
This statement is correct. The Tyndall effect occurs when the particle size is comparable to the wavelength of light. If the particles are much smaller, the scattering effect is too weak to be visible.
(C) Colour of colloidal solution depends on the wavelength of light scattered by the dispersed particles:
This statement is correct. The color observed in colloidal solutions is a result of the scattering of light, and this depends on the size of the particles and the wavelength of light they scatter.
(D) Brownian movement is due to the balanced bombardment of molecules of dispersion medium on colloidal particles:
This statement is incorrect. Brownian movement refers to the random motion of colloidal particles due to continuous collisions with the molecules of the dispersion medium. However, this motion is not balanced; it is random and results from uneven bombardment of molecules, not a balanced one.
The incorrect statement is (D), and it is correctly identified as the answer.
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