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

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If both Assertion and Reason are correct and Reason is the correct explanation of the Assertion. Explanation: Colloidal solutions are stable because Brownian movement actively opposes the force of gravity on colloidal particles, preventing them from settling down. This constant zig-zag motion keeps the particles dispersed, thus stabilizing the colloidal solution. Therefore, Brownian movement is the correct explanation for the stability and non-settling nature of colloidal particles.

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