Question

Assertion: Colloidal solutions are stable but colloidal particles do not settle down.

Reason: Brownian movement counters the force of gravity actively on colloidal particles.

Options

• If both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

• If both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

• If Assertion is correct but Reason is incorrect.

• If Assertion is incorrect but Reason is correct.

Answer 1

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.