Assertion: Assuming the elementary reaction to occur through molecular collisions, molecularity of a reaction is defined as the number of atoms or molecules which collide together for reaction to occur.
Reason: The sum of powers of the concentration of the reactants in the rate law expression is called the order of the chemical reaction.
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The order of reaction applies to both simple and complex reactions. A complicated reaction is composed of numerous elementary reactions. The number of molecules participating in each elementary reaction may differ, implying that the molecularity of each step may differ. As a result, discussing the molecularity of the total complex reaction is pointless.
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