Chemical Kinetics Question 216
Question: For a first order reaction $ A\to B $ the reaction rate at reactant concentration of $ 0.01M $ is found to be $ 2.0\times {10^{-5}}mol\ {L^{-1}}s^{1} $ . The half life period of the reaction is [CBSE PMT 2005]
Options:
A) 220 s
B) 30 s
C) 300 s
D) 347 s
Show Answer
Answer:
Correct Answer: D
Solution:
$ R=K[A] $
$ 2\times {10^{-5}}=K\times {10^{-2}} $
$ K=2\times {10^{-3}},{{\sec }^{-1}} $
$ {t_{1/2}}=\frac{.693}{K}=\frac{.693}{2\times {10^{-3}}}=\frac{693}{2}=347,\sec $
