Question

$\mathrm{CaO}+{\mathrm{H}}_2\mathrm{O}\to \mathrm{Ca}{\left(\mathrm{OH}\right)}_2$ is an example of which reaction?

Answer 1

Reaction between Calcium oxide and water:

• The reaction of quick lime(CaO) with water to form lime water $\mathrm{Ca}{\left(\mathrm{OH}\right)}_2$is an example of a combination reaction and the nature of the reaction is exothermic
• Combination reaction: The reaction in which two or more than two substances combine to form one single substance is called a combination reaction.

$\underset{\mathrm{Calcium}\mathrm{oxide}}{\mathrm{CaO}}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}}\to \underset{\mathrm{Calcium}\mathrm{hydroxide}}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}+\mathrm{Heat}$

• Exothermic reaction: The reaction which releases heat after a reaction is called an exothermic reaction. As we can see in the above reaction the heat released in a reaction that's why the nature of the reaction is exothermic.