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Question

# Which condition out of the following will increase the evaporation of water?

A

Increase in temperature of water

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B

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C

Less exposed surface area of water

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D

Decrease in temperature of water

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Solution

## The correct option is A Increase in temperature of waterExplanation for correct answer:-Option (A) Increase in temperature of waterEvaporation is the process of change of state from liquid to gas.During the evaporation process, when the temperature is increased, the molecules gain kinetic energy and start to move faster.The molecules must overcome the intermolecular forces of attraction in order to become a gas from liquid.Thus increase in temperature increases the rate of evaporation of water.Hence it is the correct option.Explanation for incorrect answer:-Option (B) Adding common salt to waterOn the addition of common salt to water, the rate of evaporation decreases.This is because, the surface will now be occupied by the solvent (water) as well as non-volatile solute particles that is salt.This will reduce the escaping tendency of water molecules in order to evaporate.Hence it is the incorrect option.Option (C) Less exposed surface area of waterEvaporation is a surface phenomenon.This means that, the more the surface area of the exposed liquid, the more will be the rate of evaporation.If the surface area of the water is less exposed, then the rate of evaporation will decrease.Hence it is the incorrect option.Option (D) Decrease in temperature of waterDuring the evaporation process, when the temperature is increased, the molecules gain kinetic energy and start to move faster.The molecules must overcome the intermolecular forces of attraction in order to become a gas from liquid.Thus increase in temperature increases the rate of evaporation of water.Therefore, if the temperature is decreased, the rate of evaporation will also decrease.Hence it is the incorrect option.Therefore, option (A) Increase in temperature of water is the correct answer.

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