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JCECE Engineering JCECE Engineering Solved Paper-2006

  • question_answer
    If the \[75%\] of a first order reaction is complete in\[8\min \], then time taken to decompose \[50%\] of its initial amount is:

    A) \[2\min \]                           

    B) \[4\min \]

    C)  \[12\min \]                       

    D)  \[1\min \]

    Correct Answer: B

    Solution :

    First order kinetic equation is:                 \[k=\frac{2.303}{t}\log \frac{a}{(a-x)}\] or            \[t=\frac{2.303}{k}\log \frac{a}{(a-x)}\] According to question                 \[8=\frac{2.303}{k}\log \frac{100}{100-75}\]


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