Write one reaction for each of the following:
Evolution of heat

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Solution

Exothermic reaction:
The reaction in which energy is released is called an exothermic reaction.
The energy that is released can be of different forms like heat, sound, light, electricity, and so on.
Example of an exothermic reaction :
When Calcium oxide $(CaO)$ reacts with water $(H_{2} O)$ , it gives Calcium hydroxide( $Ca {(OH)}_{2}$ ) as a product along with the evolution of heat.
$CaO (s) + H_{2} O (l) \to Ca {(OH)}_{2} (s) + ∆ (Calcium oxide) (water) (Calcium hydroxide) (heat)$

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Write one reaction for each of the following:Evolution of heat

Write one reaction for each of the following:
Evolution of heat