Question

Which control mode doea not change order of reaction?

Answer 1

it is possible for a catalyst to change the order of a reactionsince it shows different path to the reaction i.e. reaction occurs through different mechanism. In the new path, rate determining step (slow step) may involve different number of reactant molecules.

Answer 2

The second difference is that in a first order reaction, the rate of reaction depends on all the reactants whereas, in a pseudo-first-order reaction, the rate of reaction depends only on the isolated reactant since a difference in concentration of the reactant in excess will not affect the reaction.