Which of the following statements are applicable to a balanced chemical equation of an elementary reaction?


For an elementary reaction (Reaction in which one or reactants react in a single step to for a product) the molecularity and the order is the same for example

A + BProducts (single-step elementary reaction)


R=k[A][B]


Order = 1+1=2


Molecularity is 2, therefore, molecularity and order are the same.


Molecularity is the number of the reacting species (atoms or molecules) that must collide in order to give a stable product.


Hence the molecularity of a reaction can never be zero or non-integer for a complete reaction.

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