Molecularity of the reaction

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is never be a whole number

is always a whole number

can have a fractional value

can be zero

answer is A.

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Detailed Solution

Molecularity is always a whole number (not zero) and it is never be a zero or fractional. Molecularity of a reaction is equal to the total number of reactant molecule taking part in an elementary reaction.

$2 NO + O_{2} \to 2 {NO}_{2}$

$∴$ Molecularity is 3, which is a whole number.

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