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Question
Assertion: The mixing of two completely miscible liquids A and B showing positive deviation from Raoult’s law is followed by an absorption of heat.
Reason: The A-A molecular interaction forces are stronger than the A-A or B-B molecular interaction forces.
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.
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Solution
If Assertion is CORRECT but Reason is INCORRECT.
Explanation:
Liquids showing positive deviation from Raoult’s law absorb heat on mixing because the A-B intermolecular forces are weaker than those in the pure liquids (A-A and B-B). This weak interaction leads to less stability and thus endothermic mixing. However, the reason given is incorrect because it wrongly compares A-A forces to themselves, making the statement illogical.
