(A) : The angle of contact of a liquid decrease with increase in temperature.
(R) : With increase in temperature, the surface tension of liquid decreases

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'A' is true and 'R' is false

Both 'A' and 'R' are true and 'R' is not the correct explanation of 'A'

Both 'A' and 'R' are true and 'R' is the correct explanation of 'A'

'A' is false and 'R' is true

answer is D.

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Detailed Solution

When temperature rises, the surface tension of the liquid lowers. As the liquid's surface tension decreases, the liquid's cohesive forces decreases increasing the angle of contact.

The assertion is false while the reason is true .

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