Which of the following statement/s is/are correct?
I. Half-life is 50 % of the total time taken for the completion of a reaction
II. Collision frequency (Z), which is the number of collisions per second per unit volume, is same as the rate constant of the reaction
III. A change in the activation energy of a reaction at a particular temperature will result in a proportional change in the rate and rate constant of the reaction at the same temperature
IV. All first order reactions are not unimolecular
V. For a zero order reaction, slope of a plot of $$t_{1/2}$$ Vs. initial concentration will be zero