"Reactions with zero order is possible, but zero molecularity is not". Justify the statement.

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Solution

$a A + b B ⟶ c C + d D R a t e = K {[A]}^{x} [B]^{y}$
If $^{'} (a + b)^{'} =^{'} (x + y)^{'}$ then the reaction is an elementary reaction but if $^{'} (a + b)^{'} \neq^{'} (x + y)^{'}$ then it is not an elementary reaction.
From experiments we know that zero order reactions are possible but molecularity can never be zero as $^{'} (a + b)^{'}$ can never be zero. Hence, zero molecularity is not possible.

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