Q. 22

Which of the foll A. Order is same as molecularity.

B. Order is less than the molecularity.

C. Order is greater than the molecularity.

D. Molecularity can never be zero.

Answer :

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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