Why can’t molecularity of any reaction be equal to zero?

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(N/A) Molecularity is defined as the number of reacting species (atoms,ions,or molecules) taking part in an elementary reaction,which must collide in order to bring about a chemical reaction. Since a chemical reaction cannot occur without the participation of at least one reactant molecule,the minimum value for molecularity is $1$. Therefore,molecularity cannot be zero.

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For the reaction $X_{2(g)} + Y_{2(g)} \rightarrow 2XY_{(g)}$,the following data are observed:
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$0.1$$0.1$$5 \times 10^{-6}$
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$A$ study of chemical kinetics of the reaction $A + B \to$ Products,gave the following data at $25 \ ^oC$.
$Exp. \ No.$ $[A]$ $[B]$ $Rate$
$1.$ $1.0$ $0.15$ $4.2 \times 10^{-6}$
$2.$ $2.0$ $0.15$ $8.4 \times 10^{-6}$
$3.$ $1.0$ $0.20$ $5.6 \times 10^{-6}$

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Higher order $(> 3)$ reactions are rare due to:

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