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NEET Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Self Evaluation Test - Chemical Kinetics

  • question_answer
    The half-life of a radioactive element is 20 min. The time interval between the stages of its 33% and 67% decay is

    A) 40 min              

    B) 20 min

    C) 30min              

    D) 25 min

    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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