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. $



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