Question

Assertion: Evaporation causes cooling.
Reason: Particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation
A. Both Assertion and Reason are correct and reason is the correct explanation for assertion.
B. Both Assertion and Reason are correct and reason is not the correct explanation for assertion.
C. Assertion is correct but Reason is incorrect
D. Assertion is incorrect but Reason is correct

Answer 1

There is some energy involved or rather absorbed in a process, which causes a cooling effect. This energy is called Latent Heat. As we know that this energy is absorbed from surrounding, so it will make surrounding cool.

Complete step by step answer:
Evaporation is the process of conversion of liquid substance into gases below its boiling point. The best example is drying clothes. The water in clothes evaporates by taking external heat from surrounding, the water in clothes does not need a boiling point of temperature, rather below that temperature itself, water will evaporate.
Another famous example includes earthen water pots, which cools water inside it.
One more example is, we feel cool when sweat on our body starts evaporating.
In all of these processes, the particles or molecules of liquid absorb the heat and when it reaches Latent Heat of vapourization, then evaporates and this heat or energy is absorbed from surrounding thus making the surrounding cool. Thus, the process of evaporation causes cooling.
Latent heat is actually in general the heat or energy required for phase change. Here, in all the above examples, liquid is converted into gases, so a specific term called latent heat of vapourization is used.
Thus we conclude that option (A) is correct, which says, Both Assertion and Reason are correct and reason is the correct explanation for assertion.

Additional information: The multiple examples given above are showing us how evaporation causes cooling. In previous, early days when there was no refrigerator so this phenomena of Evaporation was used to keep things cool and protected. Even Desert cooler can be a good example for cooling caused by evaporation.

Note:
It is a useful phenomena and can be used for practical purposes in our day today life. We should note and remember that latent heat never changes temperature, it is energy at a fixed temperature, and only the state of matter is changed. This latent heat can be absorbed or released depending on state change of matter.