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The overall reaction order for A + B → C + D is two. It implies that ______

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The overall reaction order for A + B → C + D is two. It implies that ______

(a) reaction may be non-elementary and molecularity is two

(b) reaction may be elementary and molecularity is two

(c) reaction is non-elementary and molecularity is two

(d) reaction is elementary and molecularity is two

I have been asked this question in semester exam.

This intriguing question originated from Reaction Order and Elementary Rate Law topic in section Rate Laws and Stoichiometry of Chemical Reaction Engineering

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Correct choice is (d) reaction is elementary and molecularity is two

The explanation is: Order is equal to molecularity when reaction is elementary.

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