# Question #d3beb

##### 1 Answer

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