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EAMCET Medical EAMCET Medical Solved Paper-2005

  • question_answer
    The time taken for the completion of 90% of a first order reaction is t min. What is the time (in sec) taken for the completion of 99% of the reaction?

    A)  2t                                          

    B)  \[\frac{t}{30}\]

    C)  \[120t\]                              

    D)  \[60t\]

    Correct Answer: A

    Solution :

                     For first order reaction, \[k=\frac{2.303}{{{t}_{1}}}\log \frac{100}{100-90}=\frac{2.303}{{{t}_{2}}}\log \frac{100}{100-99}\] \[\therefore \]  \[\frac{1}{t}\log 10=\frac{1}{{{t}_{2}}}\log 100\] or,                          \[\frac{1}{t}=\frac{1}{{{t}_{2}}}\times 2\] \[{{t}_{2}}=2t\,s\]


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