Q.

Assertion : Viscosity of a liquid decreases on increasing the temperature. 

Reason : Evaporation of liquid increases with rise in temperature. 

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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. 

answer is B.

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Detailed Solution

The correct reason is that molecules of liquid absorb heat energy thus their kinetic energy or motion increases. 

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