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BCECE Engineering BCECE Engineering Solved Paper-2009

  • question_answer
    The first order rate constant for the decomposition of \[{{\text{N}}_{\text{2}}}{{\text{O}}_{\text{5}}}\]is \[6.2\times {{10}^{-4}}{{s}^{-1}}.\] The half-life in seconds is nearly

    A)  1117.7          

    B)         111.7   

    C)         223                       

    D)         160

    Correct Answer: A

    Solution :

    For a first order reaction, half-life period, \[{{t}_{1/2}}=\frac{0.693}{k}\]                                 \[=\frac{0.693}{6.2\times {{10}^{-4}}{{s}^{-1}}}\]                                 \[=1117.7s\]


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