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

  • question_answer
    A first order reaction is half-completed in 45 minutes. How long does it need for 99.9% of the reaction to be completed?

    A) 20 hours           

    B) 10 hours

    C) \[7\frac{1}{2}\] hours                

    D) 5 hours

    Correct Answer: C

    Solution :

    [c] \[k=\frac{0.693}{45}\] further \[t=\frac{2.303}{0.693}\times 45\log \frac{100}{100-99.9}\] \[=\frac{2.303\times 45\times 3}{0.693}=7\frac{1}{2}hours.\]


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