Half life period for a first–order reaction is 10 minutes. How much time is required to change the concentration of the reactants  from 0.08M to 0.01M

Q: Half life period for a first–order reaction is 10 minutes. How much time is required to change the concentration of the reactants  from 0.08 M to 0.01 M

(A) 20 min                                                

(B) 30 min

(C) 40 min                                                

(D) 50 min

Ans: (A)