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AFMC AFMC Solved Paper-2010

  • question_answer
    The reaction, \[{{N}_{2}}{{O}_{5}}\]in \[CC{{l}_{4}}(solution)\xrightarrow[{}]{{}}2N{{O}_{2}}(solution)+\frac{1}{2}{{O}_{2}}(g)\]is of first order in \[{{N}_{2}}{{O}_{5}}\]with rate constant \[6.2\times {{10}^{-4}}{{s}^{-1}}.\] What is the value of rate of reaction  when \[[{{N}_{2}}{{O}_{5}}]=1.25\,mol\,{{L}^{-1}}\]?

    A)  \[5.15\times {{10}^{-5}}\,mol\,{{L}^{-1}}{{s}^{-1}}\]

    B)  \[6.35\times {{10}^{-3}}\,mol\,{{L}^{-1}}{{s}^{-1}}\]

    C)  \[7.75\times {{10}^{-4}}\,mol\,{{L}^{-1}}{{s}^{-1}}\]

    D)  \[3.85\times {{10}^{-4}}\,mol\,{{L}^{-1}}{{s}^{-1}}\]

    Correct Answer: C

    Solution :

                     For first order reaction, \[Rate=k[{{N}_{2}}{{O}_{5}}]\] \[=6.2\times {{10}^{-4}}{{s}^{-1}}\times 1.25\,mol\,{{L}^{-1}}\] \[=7.75\,\times {{10}^{-4}}\,mol\,{{L}^{-1}}{{S}^{-1}}\]


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