Chemical Kinetics Question 163
Question: The rate constant of a reaction is $ 0.69\times {10^{-1}}{{\min }^{-1}} $ and the initial concentration is $ 0.2mol,{l^{-1}}. $ The half-life period is [AIIMS 1998]
Options:
A) 400 sec
B) 600 sec
C) 800 sec
D) 1200 sec
Show Answer
Answer:
Correct Answer: B
Solution:
The unit of rate constant shows that reaction is of first order. For first order reaction, half life is independent of initial conc. of the reactant.
Thus, $ {t_{1/2}}=\frac{0.693}{0.69\times {10^{-1}}}=\frac{0.693\times 60}{0.69\times {10^{-1}}}=600,\sec $
