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Which of the following statements about reaction order is correct?

1. Stoichiometry of a reaction tells about the order of the elementary reactions.
2. For a zero order reaction, rate and the rate constant are identical.
3. A zero order reaction is controlled by factors other than concentration of reactants.
4. A zero order reaction is always elementary reaction.

Correct answer: For a zero order reaction, rate and the rate constant are identical.

Solution

For a zero order reaction rate = k[A]⁰ = k, so the rate equals the rate constant; this statement is correct.

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