Q.

Which of the following statement is incorrect about the molecularity of a reaction?

A. it is a theoretical concept
B. each step of a multi-step reaction has a unique molecularity
C. it is equal to the total number of reactants taking part in elementary step
D. it can be zero, fractional or integer
Answer» D. it can be zero, fractional or integer
Explanation: molecularity is always a whole number. it can be neither zero nor fractional. all the other options are correct.
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