7. Assertion : The angle of contact of a liquid decrease with increase in temperature. Reason : With increase in temperature, the surface tension of liquid increase.

Read the assertion and reason carefully to mark the correct option out of the options given below:

(a)       If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)       If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)        If assertion is true but reason is false.

(d)       If the assertion and reason both are false.

(e)       If assertion is false but reason is true.

Ans. (c) With increase in temperature surface tension of the liquid decreases and angle of contact also decreases.

(4)