Q.13..You are provided with a mixture of naphthalene and ammonium chlorideby your teacher. Suggest an
activity to separate them with well labelled diagram.
Q.14...It is a hot summer day, Priyanshi and Ali are wearing cotton and nylonclothes respectively. Who do you
think would be more comfortable and why?
Q.15...You want to wear your favourite shirt to a party, but the problem is that itis still wet after a wash. What
steps would you take to dry it faster?
Q.16..Comment on the following statements:
(a)Evaporation produces cooling.
(b)Rate of evaporation of an aqueous solution decreases with increase inhumidity
.(c)Sponge though compressible is a solid
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14.Priyanshi would be more comfortable . The reason is that we get a lot of sweet an our body in a hot summer day.
Cotton being a good absorbed of water, absorbs sweat from the body and provides larger surface area for evaporation which causes more cooling effect. Nylon does not absorb sweat, so the sweat does not evaporation and Ali would feel uncomfortable.
15.Dry it under the fan.Under the fan when the speed of wind increases, the particles of water vapour from the shirt move away with the wind, decreasing the amount of water vapour in the surroundings. It increases the rate of evaporation of water and the washed wet shirt dries more quickly.
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