Question

\[\ce{CaO + H2O -> Ca(OH)2 + Heat}\] is an example of ______ reaction.

Options

• Exothermic

• Electrolysis

• Decomposition 

• Endothermic

Answer 1

\[\ce{CaO + H2O -> Ca(OH)2 + Heat}\] is an example of exothermic reaction.

Explanation:

In the reaction \[\ce{CaO + H2O -> Ca(OH)2 + Heat}\], heat is released during the formation of calcium hydroxide. Any chemical reaction in which heat energy is given out to the surroundings is called an exothermic reaction. Hence, this reaction is exothermic.