Which of the following statements is not correct about order of a r...

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Which of the following statements is not correct about order of a reaction.
(i) The order of a reaction can be a fractional number.
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(ii) Order of a reaction is experimentally determined quantity.
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(iii) The order of a reaction is always equal to the sum of the stoichiometric coefficients of reactants in the balanced chemical equation for a reaction.
(iv) The order of a reaction is the sum of the powers of molar concentration of the reactants in the rate law expression.
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