Chemical Reaction Engineering
The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

Molecularity of the reaction is 2, but the reaction may not be elementary
Reaction is elementary with a molecularity of 2
Reaction may be elementary with molecularity of 2
Reaction is elementary but the molecularity may not be 2

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Chemical Reaction Engineering
In a zero order reaction, reactants concentration does not change with time and the

Time for half change is independent of the initial concentration
Reaction rate is trebled when the initial concentration is trebled
Time for completion of the reaction is independent of the initial concentration
Time for half change is half the time taken for completion of the reaction

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