The terms rate of reaction and rate of appearance ( or disappearance) of reactant ( or product)

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may or may not have same value depending upon the stoichiometric coefficient of reactant (or product) in the balanced chemical equation

represent one and the same physical quantity

are positive parameters and have same value

differ by a constant factor

answer is D.

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Detailed Solution

Unless a reactant's stoichiometric number in a chemical equation is one, the rate of reaction and the rate of appearance of that reactant are two distinct quantities.

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