Chemical Kinetics and Nuclear ChemistryHard
Question
Which of the following statements are correct about half-period.
Options
A.It is proportional to initial concentration for zeroth order
B.Average life = 1.44 half-life for first order reaction.
C.Time of 75% completion of reaction is thrice of half-life(initial half life) period in second order reaction
D.99.9% reaction takes place in 100 minutes for the case when rate constant is 0.0693 min-1
Solution
(a) t1/2 ∞ 
(b) tavg =
(c) For second order reaction t1/2 =
+ Kt
At t = t75% Ct =
+ Kt75%
t75% =
t75% = 3 × t1/2
(b) tavg =
(c) For second order reaction t1/2 =
+ KtAt t = t75% Ct =
+ Kt75% t75% =
t75% = 3 × t1/2
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