NEET Solved Paper 2019 Question 15
Question: If the rate constant for a first order reaction is k, the time (t) required for the completion of 99 % of the reaction is given by-[NEET 5-5-2019]
Options:
A) t = 4.606/k
B) t = 2.303/k
C) t = 0.693/k
D) t = 6.909/k
Show Answer
Answer:
Correct Answer: A
Solution:
Chemical kinetics $ t=\frac{2.3}{K}\log \frac{a}{a-x} $
$ =\frac{2.3}{k}\log \frac{1.0}{1} $
$ \frac{2.303\times 2}{k} $
$ {t _{99}}=\frac{6.606}{k}4.606/k $
