1.

In a first order reaction, the concentration of the reactant, decrease from 0.8M to 0.4M in 15minutes. The time taken for the concentration to changes from 0.1M to 0.025M is

Answer»

7.5 minutes
15 minutes
30 minutes
60 minutes

Solution :The `t_((1)/(2))` is 15 minuts. To fall the concentrationn from 0.1 to 0.025 we need TWO HALF LIVES i.e., 30 minutes.


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