Assertion: The soap micelle is a negatively charged colloidal particle. Reason: The negative charge on the micelle is due to the presence of OH− ions of water.

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If Assertion is correct but Reason is incorrect. Explanation: The soap micelle is indeed a negatively charged colloidal particle because soap molecules dissociate into negatively charged RCOO− ions, which form micelles with negative charge on the surface. However, this negative charge is not due to OH− ions of water but due to the dissociation of soap molecules themselves into RCOO− ions. Hence, the reason given is incorrect, as the negative charge originates from the soap molecules, not water hydroxide ions.

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