Question

In a first order reaction the reacting substance has half-life period of ten minutes. What fraction of the substance will be left after an hour the reaction has occurred ? :

(A) 1/6 of initial concentration

(B) 1/64 of initial concentration

(C) 1/12 of initial concentration

(D) 1/32 of initial concentration

Answer 1

Correct Answer is: (B) 1/64 of initial concentration

t_1/2 = 10

No. of Half life = 60/10 = 6 half life