Chemical Kinetics Question 269
Question: The half-life of a radioactive element is 20 min. The time interval between the stages of its 33% and 67% decay is
Options:
A) 40 min
B) 20 min
C) 30min
D) 25 min
Show Answer
Answer:
Correct Answer: B
Solution:
[b] Change in 67% to 33% is almost half the concentration change. 67% $ \xrightarrow[change]{Half}33.5(\approx 33 $ %) So time interval between the stages of its 33% and 67% decay is same as $ {t_{1/2}}=20min. $
