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Question
Which condition out of the following will increase the evaporation of water?
Which condition out of the following will increase the evaporation of water?
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Solution
The correct option is A Increase in temperature of water
Explanation for correct answer:-
Option (A) Increase in temperature of water
- Evaporation 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 water
- On 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 water
- Evaporation 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 water
- 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.
- 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.
Increase in temperature of water
Explanation for correct answer:-
Option (A) Increase in temperature of water
- Evaporation 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 water
- On 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 water
- Evaporation 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 water
- 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.
- 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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