A chemical reaction in which energy is liberated is called :

exothermic reaction

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physical change

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endothermic reaction

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photochemical reaction

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Solution

The correct option is A exothermic reaction
A reaction in which energy is released to the surroundings is called an exothermic reaction.
In this type of reaction the enthalpy, or stored chemical energy is lower for the products than the reactants.
Hence, the correct option is $A$

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