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JEE Main & Advanced Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Rate law and Rate Constant

  • question_answer
    A first order reaction requires 30 minutes for 50% completion. The time required to complete the reaction by 75% will be

    A)                 45 minutes         

    B)                 15 minutes

    C)                 60 minutes         

    D)                 None of these

    Correct Answer: C

    Solution :

               \[k=\frac{0.693}{30}=0.0231\] ; \[t=\frac{2.303}{k}\log \left( \frac{100}{100-75} \right)\]                                 \[t=\frac{2.303}{0.0231}\log 4=60\,\text{minutes}\]


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