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Which of the following statement(s) is//...

Which of the following statement(s) is//are correct ?

A

The rate of a reaction is always proportional to the concentrations of reactants.

B

The order of an elementary chemical reaction step can be determined by examining its stoichiometry.

C

The first-order reactions follow an exponential time course.

D

The degree of dissociation for first order reaction is `1-e^(-kt)`

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