Question

Evaporation of water is:
A) A process by which neither heat is evolved or nor observed.
B) A process accompanied by chemical reaction.
C) An exothermic change.
D) An endothermic change.

Answer 1

Evaporation is the process by which a compound or an element changes from its liquid state to its gaseous state below the temperature at which it boils in a simple way the process by which liquid water reaches the atmosphere as water vapour.

Complete answer:
In the process of evaporation, water gets heated by the surrounding temperature, in this way the molecules of water gain energy to enter the gaseous stage. And in this energy change process temperature also changes according to the state of matter from which energy is transferred.
Now let's examine all the options to find out the correct answer.
Option number (A) states that evaporation is a process in which neither heat is evolved or absorbed, as temperature changes during evaporation because the molecules of water get energy from surrounding them so the Heat energy is absorbed by the molecules. Therefore this option is incorrect.
Option number (b) states that evaporation is a process accompanied by chemical reaction so this option is also incorrect because evaporation is a natural phenomenon where the transfer of heat is involved.
Option number (C) states that evaporation is an exothermic change so this option is also incorrect because exothermic change means Liberation of heat or release of heat but in evaporation heat is absorbed by molecules to change into gaseous state from liquid state.
Option number (D) states that evaporation of water is an endothermic process.endothermic means absorbing of heat So this option is the correct option because in the process of evaporation heat is absorbed by the molecules to get into gases stage.

Hence the correct answer is Option (D).

Note: Evaporation and vaporization are the same process but different terms. Vaporization means converting the water into water vapour by providing it heat, while vaporization is converting water on earth surface into water vapour by natural phenomena.