By Sunil Bhardwaj

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#Molecularity Of ReactionOrder of Reaction
1Molecularity is the number of reacting species which undergo simultaneous collisions in the elementary or simple reactions.It is the sum of powers of the concentrations terms in the rate law equation.
2It is a theoretical concept.It can be determined experimentally.
3It is always a whole number.It can be whole number as well as fraction.
4It can never be zero.It can be zero.
5It has no significance for a complex reaction and can be expressed for each elementary step in case of a complex reaction.It is always the same for the overall reaction whether the reaction is complex or simple.