Assertion :Surface tension decreases on increasing temperature. Reason: Intermolecular attractive forces are comparatively smaller at higher temperatures.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The strength of surface tension depends on intermolecular forces. As temp. increases, molecules of the liquid becomes more active and they move more rapidly. So, the intermolecular forces are more unstable.

Surface tension decreases with increasing temperature.

So, the correct answer is option $A$ .

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