Assertion :Colloidal solutions are stable but colloidal particles do not settle down. Reason: Brownian movement counters the force of gravity actively on colloidal particles.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The Brownian movement of particles is due to bombardment on the particles by the molecules of the dispersion medium. Thus Brownian movement does not permit the particles to settle down and induces stability of colloidal solution.

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