What do you understand by exothermic reaction and endothermic reaction? Give one example of each type. a) Exothermic Reaction: A process that releases energy to its surroundings. Example: Combustion of propane. b) Endothermic Reaction: A process that absorbs energy from its surroundings. Example: Dissolution of ammonium chloride in water. c) Exothermic Reaction: A process that absorbs energy from its surroundings. Example: Photosynthesis. d) Endothermic Reaction: A process that releases energy to its surroundings. Example: Freezing of water.