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Question

Assertion :A capillary is dipped in a liquid and liquid rises to a height h in it. As temperature of the liquid is raised, the height h increase (if the density of the liquid and angle of contact remain the same) Reason: Surface tension of a liquid decreases with the rise in its temperature.

A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is incorrect but Reason is correct
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D
Both Assertion and Reason are incorrect
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Solution

The correct option is C Assertion is incorrect but Reason is correct
Assertion is incorrect but the reaton is correct.
We know that,
h=2 T cosθR 1 g
As the temperature is raised, the surface tension (T) decreases.
As a result, the capillary raise (h) also decreases if density (e) and contact angle (θ) in unaltered.

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