Q. 21

Note : In the following questions two or more options may be correct.

Rate law cannot be determined from balanced chemical equation if _______.

A. reverse reaction is involved.

B. it is an elementary reaction.

C. it is a sequence of elementary reactions.

D. any of the reactants is in excess.

Answer :

Rate law cannot be determined if a reaction is reverse as the product formation and dissociation takes place simultaneously similar for its reactant hence impossible to plot a graph of concentration vs time.

Rate law cannot be determined for a reaction involved in steps as different intermediate and by-products are simultaneously formed in those step hence difficult to monitor their concentration with time.


Rate law can not be determined for a reaction in which reactant is in excess since its rate of disappearance will be constant at every time.

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