Question

Assertion (A): True solution do not show Tyndall effect. Reason (R): When a flash of light is passed through colloidal solution its path gets illuminated. A.Both (A) and (R) are true and (R) is correct explanation of (A) B.Both (A) and (R) are true but (R) is not correct explanation of (A) C.(A) is true and (R) is false D.(A) is false and (R) is true

Answer 1

True solutions do not show Tyndall effect because the particles in a true solution are too small to scatter light. When a flash of light is passed through a colloidal solution, the path of light gets illuminated due to scattering by the particles, which explains why true solutions do not show Tyndall effect.

Step-by-step explanation:

Tyndall effect is the scattering of light by particles in a colloidal solution or suspension. It is a phenomenon observed when a beam of light passes through a transparent medium and is scattered in different directions by the particles present in the medium. In a true solution, the particles are extremely small and do not scatter light, so they do not show Tyndall effect. Therefore, Assertion (A) is true.

When a flash of light is passed through a colloidal solution, the path of light gets illuminated due to scattering by the particles. This is the reason given in Reason (R) and it correctly explains why true solutions do not show Tyndall effect. Therefore, Reason (R) is a correct explanation of Assertion (A).

Therefore, the correct option is A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

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