For a complex reaction ……… .

Options

A. Order of overall reaction is same as molecularity of the slowest step
B. Order of overall reaction is less than the molecularity of the slowest step
C. order of overall reacticn is greater than molecularity of the slowest step
D. molecularity of the slowest step is never zero or non-integer

Answer

A, D

Explanation

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