Which of the following is an exothermic process?
Which of the following is an exothermic process?
The correct option is D Condensation of water vapour
Explanation for correct option:
D:
- Exothermic processes are the ones in which energy is released during occurrence of the process.
- Condensation of any substance is the process in which the vapor or gas phase of that substance changes into liquid phase.
- Since the interparticle attraction in the liquid state is higher than the gas phase, thus, the high energy state of particles converts into lower energy state of particles hence, energy is released in the form of heat during the condensation process.
- In condensation of water vapor, the gas phase of water converts into liquid Water.
- Due to the liberation of energy, the given process is exothermic.
Explanation for incorrect options:
A: Melting of any substance involves the conversion of the solid phase of that substance to its liquid phase. Since the interparticle attraction in the liquid state is lower than the solid phase, energy is consumed in the form of heat during the melting process.
In melting of Ice, the solid phase of water converts into liquid water with the absorption of energy. Hence, the given process is endothermic not exothermic.
B: Evaporation of any substance involves the conversion of the liquid phase of that substance to its gas phase. Since the interparticle attraction in the liquid state is higher than the gas phase, energy is consumed in the form of heat during the evaporation process.
In evaporation of water, the liquid phase of water converts into gas phase with the absorption of energy. Hence, the given process is endothermic not exothermic.
C: Boiling of any substance involves the conversion of some of the liquid phase of that substance to its gas phase. Since the interparticle attraction in the liquid state is higher than the gas phase, energy is consumed in the form of heat during the evaporation process.
In boiling of soup, some of the liquid phase of soup converts into the gas phase with the absorption of energy. Hence, the given process is endothermic not exothermic.
Final Answer:
Hence, option D is correct.
Condensation of water vapour
Explanation for correct option:
D:
- Exothermic processes are the ones in which energy is released during occurrence of the process.
- Condensation of any substance is the process in which the vapor or gas phase of that substance changes into liquid phase.
- Since the interparticle attraction in the liquid state is higher than the gas phase, thus, the high energy state of particles converts into lower energy state of particles hence, energy is released in the form of heat during the condensation process.
- In condensation of water vapor, the gas phase of water converts into liquid Water.
- Due to the liberation of energy, the given process is exothermic.
Explanation for incorrect options:
A: Melting of any substance involves the conversion of the solid phase of that substance to its liquid phase. Since the interparticle attraction in the liquid state is lower than the solid phase, energy is consumed in the form of heat during the melting process.
In melting of Ice, the solid phase of water converts into liquid water with the absorption of energy. Hence, the given process is endothermic not exothermic.
B: Evaporation of any substance involves the conversion of the liquid phase of that substance to its gas phase. Since the interparticle attraction in the liquid state is higher than the gas phase, energy is consumed in the form of heat during the evaporation process.
In evaporation of water, the liquid phase of water converts into gas phase with the absorption of energy. Hence, the given process is endothermic not exothermic.
C: Boiling of any substance involves the conversion of some of the liquid phase of that substance to its gas phase. Since the interparticle attraction in the liquid state is higher than the gas phase, energy is consumed in the form of heat during the evaporation process.
In boiling of soup, some of the liquid phase of soup converts into the gas phase with the absorption of energy. Hence, the given process is endothermic not exothermic.
Final Answer:
Hence, option D is correct.
