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Assertion : Most of the chemical reactio...

Assertion : Most of the chemical reactions do not start automatically.
Reason : Reactant molecules have an energy barrier to become reactive.

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The chemical or metabolic conversion refers to a reaction. Most of the chemical reaction do not start auotomatically because the reactant molecules have an energy barrier to become reactive. Therefore, an external supply of energy is needed for the start of the chemical reaction. It is called activation energy. Enzymes lower the activation energy required for a reaction.
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