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Which of the following is true about elementary reactions?

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Which of the following is true about elementary reactions?

(a) They occur in multiple steps

(b) They are complex in nature

(c) Order of elementary reaction is an integer

(d) All first order reactions are elementary

I had been asked this question in a job interview.

This is a very interesting question from Reaction Rates in section Basic Concepts of Chemical Reaction Engineering

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The correct choice is (c) Order of elementary reaction is an integer

Explanation: The order of an elementary reaction can never take fractional values. Elementary reactions occur in a single step. First order reactions can be elementary or non- elementary.

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