In the following questions two or more options may be correct.
Rate law cannot be determined from the balanced chemical equation if _______.
(i) the reverse reaction is involved.
(ii) it is an elementary reaction.
(iii) it is a sequence of elementary reactions.
(iv) any of the reactants is in excess
The answer is the option (i, iii, iv). From a balanced chemical equation rate law can only be determined if it is an elementary reaction.