NEET Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Self Evaluation Test - Chemical Kinetics

  • question_answer
    The reactions rate \[{{N}_{2}}\left( g \right)+3{{H}_{2}}\left( g \right)\to 2N{{H}_{3}}\left( g \right)\]was measured\[\frac{d[N{{H}_{3}}]}{dt}=2\times {{10}^{-4}}mol\,{{\sec }^{-1}}\]. The rates of reactions expressed in terms of \[{{N}_{2}}\]and \[{{H}_{2}}\] are

    A)
    Rate in terms of \[{{N}_{2}}\] \[(mol\,{{L}^{-1}}se{{c}^{-1}})\] Rate in terms of \[{{H}_{2}}\] \[(mol\,{{L}^{-1}}se{{c}^{-1}})\]
    \[2\times {{10}^{-4}}\] \[2\times {{10}^{-4}}\]

    B)
    Rate in terms of \[{{N}_{2}}\] \[(mol\,{{L}^{-1}}se{{c}^{-1}})\] Rate in terms of \[{{H}_{2}}\] \[(mol\,{{L}^{-1}}se{{c}^{-1}})\]
    \[3\times {{10}^{-4}}\] \[1\times {{10}^{-4}}\]

    C)
    Rate in terms of \[{{N}_{2}}\] \[(mol\,{{L}^{-1}}se{{c}^{-1}})\] Rate in terms of \[{{H}_{2}}\] \[(mol\,{{L}^{-1}}se{{c}^{-1}})\]
    \[1\times {{10}^{-4}}\] \[3\times {{10}^{-4}}\]

    D)
    Rate in terms of \[{{N}_{2}}\] \[(mol\,{{L}^{-1}}se{{c}^{-1}})\] Rate in terms of \[{{H}_{2}}\] \[(mol\,{{L}^{-1}}se{{c}^{-1}})\]
    \[2\times {{10}^{-1}}\] \[2\times {{10}^{-3}}\]

    Correct Answer: C

    Solution :

    [c]\[{{N}_{2}}+3{{H}_{2}}\rightleftharpoons 2N{{H}_{3}}\]; Rate is given by any of the expressions \[-\frac{d\left[ {{N}_{2}} \right]}{dt}=-\frac{1d\left[ {{H}_{2}} \right]}{3dt}\text{=}\frac{1}{2}\frac{d\left( N{{H}_{3}} \right]}{dt}\] Rate of disappearance of \[{{N}_{2}}=\frac{1}{2}\]the rate of formation of \[N{{H}_{3}}=1\times {{10}^{-4}}\] Rate of disappearance of \[{{H}_{2}}=3/2\] the rate of formation of \[N{{H}_{3}}=3\times {{10}^{-4}}\]


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