Statement-I: Increase in rate constant of endothermic reaction is less than that for an exothermic reaction with increase in temperature.
Statement-II: Rate of zero order reaction remains constant with time.
I) As temperature increases, number of activated molecules increases. Rate constant of both exothermic and endothermic reaction increases;
Magnitude of increase is more in endothermic reaction than in exothermic reaction because the increase in the fraction of activated molecules in endothermic reactions is more than in exothermic reactions.
II) For a zero order reaction
rate of reaction remains constant with time.
Concentration changes of reactant/reactants has no influence on rate of the reaction.