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1. If the stirring speed increased from 300 to 500 rpm leads to an increase in the reaction rate by two folds. Then it may be concluded that
(A): the movement of molecules in the reactor at 300 rpm occurred due to diffusion alone
(B): the reaction did not involve any mass transfer step
(C): the reaction was mass transfer limited at 300 rpm
(D): the reaction was mass transfer limited at 500 rpm
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