Question

Which of the following reactions is an example of endothermic reaction?

• A. Burning of a candle
• B. Freezing of water into ice cubes
• C. Evaporation of liquid water to form water vapour
• D. Acid-base neutralization reaction

Answer 1

The correct option is C Evaporation of liquid water to form water vapour

The term endothermic describes a process or a reaction in which the system absorbs energy in the form of heat whereas, in the case of an exothermic process, energy in the form of heat is released.
Burning of a candle, freezing of water and acid-base neutralization are all exothermic in nature as heat is released during these reactions
Whereas, evaporation of water to form water vapour is an endothermic reaction because it requires heat to be absorbed by the liquid state to change to its gaseous state.