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  • Comment on the following statements: (a) Evaporation produces cooling. (b) Rate of evaporation of an aqueous solution decreases with increase in humidity c Sponge though compressible is a solid

Comment on the following statements:

(a) Evaporation produces cooling.
(b) Rate of evaporation of an aqueous solution decreases with increase in humidity.
(c) Sponge though compressible is a solid.

Answers (1)

Sol.

a) In the process of evaporation, some molecules of liquid takes energy from other liquid molecules. By absorbing this energy, these molecules got converted in vapour.

By this process, the remaining liquid molecules will have lesser amount of energy. This decrement in energy causes cooling of liquid.

b) In the process of evaporation, liquids get converted in vapour. This Phenomenon stops after sometime due to high concentration of vapour above water surface.

At this time, sufficient number of vapour molecules are present above the liquid surface.

In humid atmosphere, water vapour molecules have high concentration. This high concentration of vapour, opposes the process of evaporation. Hence, it is difficult to evaporate in humid ambient.

c) Sponge is undoubtedly a solid as it has definite shape and volume unlike gases and liquids.

But sponge have some pores in it, where air is trapped.

When we tried to squeeze the sponge, the trapped air leaks out.

Then the space of air is occupied by the sponge, which causes it to shrink.

Therefore, it is compressible even if it is solid.

Posted by

Gurleen Kaur

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