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Evaporation

Question 9 Wh...

Question

Question 9
Which condition out of the following will increase the evaporation of water?
(a) Increase in temperature of water
(b) Decrease in temperature of water
(c) Less exposed surface area of water
(d) Adding common salt to water

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Solution

Evaporation is a process in which a liquid changes into its vapour state. When the temperature is increased the kinetic energy of water molecules is increased. So the conversion of water to vapours is made easy. Hence option (a) is correct.

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Q. Question 9
Which condition out of the following will increase the evaporation of water?
(a) Increase in temperature of water
(b) Decrease in temperature of water
(c) Less exposed surface area of water
(d) Adding common salt to water

The evaporation of water increases under the following conditions :

(a) increase in temperature, decrease in surface area

(b) increase in surface area, decrease in temperature

(c) increase in surface area, rise in temperature

(d) increase in temperature, increase in surface area, addition of common salt

Q. Which condition out of the following will increase the evaporation of water?

Which of the following changes decrease the vaporise pressure of water kept in a sealed vessel?

(a) Decreasing the quantity of water

(b) Adding salt to the water

(c) Decreasing the volume of the vessel to one-half

(d) Decreasing the temperature of the water

Fill in the blanks.

(a) To prevent the evaporation of water from lakes ………… is sprayed on the surface of the water.

(b) An increase in temperature causes ………… evaporation.

(c) The proportion of dissolved ………… in polluted water is low.

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