Answer:
(a, d)
(a) For a complex reaction, order of
overall reaction = molecularity of slowest step. As rate of overall reaction
depends upon total number of molecules involved in slowest step of the
reaction. Hence, molecularity of the slowest step is equal to order of overall
reaction.
(d) Since, the completion of any
chemical reaction is not possible in the absence of reactants. Hence, slowest
step of any chemical reaction must contain at least one reactant. Thus,
molecularity of the slowest step is never zero or non-integer.
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