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Q.

During the evaporation of a liquid

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a

The enthalpy remains unchanged

b

The internal energy decreases.

 

c

The enthalpy decreases

d

The enthalpy increases

answer is B.

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Detailed Solution

 Evaporation is the process that changes liquid water to gaseous water (water vapor). During evaporation of a liquid, energy is absorbed by the liquid to change the state of liquid to gasses i.e. the reaction is endothermic in nature and q>0. Therefore, the enthalpy increases.

Hence the correct answer is (B) the enthalpy increases.

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