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The progress of which among the following reactions results in an increase in volume?

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The progress of which among the following reactions results in an increase in volume?

(a) A → B

(b) 3A → B

(c) A → 4B

(d) 2A → B

I got this question at a job interview.

The question is from Liquid and Gas Phase Reactions in section Kinetics of Homogeneous Reactions of Chemical Reaction Engineering

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Correct choice is (c) A → 4B

The explanation: Increase in moles of product is depicted by the reaction, A → 4B. The number of moles of product is higher than that of reactant.

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