46) Let initial conc. be
The change in conc. in first 20s is
The change in conc. in first 30s is
The rate of change of conc.being independent of time interval i.e.So it is Zero order reaction.
47) We known the velocity constant of first order reaction is
Where a is the initial conc.of reactant x is the change in conc. after time 't'
48 In this problem the half life or the time for 50% consumption of reactant is 0.231min.
This means when t =0.231min
So Velocity constant of the first order reaction