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(C) The molecularity of a reaction is defined as the number of reacting species (atoms,ions,or molecules) taking part in an elementary reaction,which

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It may be either a whole number or fractional.

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(C) The molecularity of a reaction is defined as the number of reacting species (atoms,ions,or molecules) taking part in an elementary reaction,which must collide simultaneously in order to bring about a chemical reaction. $1$. Molecularity is always a whole number $(1, 2, 3, \dots)$. It can never be zero,fractional,or negative. $2$. It is a theoretical concept derived from the reaction mechanism. $3$. Therefore,the statement that molecularity may be fractional is incorrect. Thus,the correct option is $C$.

Which of the following statements regarding the molecularity of a reaction is wrong?

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