Assertion :Colloidal solutions exhibits Brownian motion. Reason: Brownian motion is responsible for stability of solutions.

Choose the correct option about assertion and reason from the following:

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Unbalanced bombardment of the particle of dispersed phase by molecules of dispersion medium causes Brownian motion. Colloidal solutions exhibit Brownian movement due to the collision of water molecules with colloidal particles.
The stirring effect due to Brownian movement does not allow the particles to settle down. Hence the Brownian movement responsible for the stability of sols.
Hence both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

Hence, the correct option is $B$

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