NEET Chemistry NEET PYQ-Chemical Kinetics

  • question_answer
    For the chemical reaction \[{{N}_{2}}\text{(g)}+3{{H}_{2}}(g)\rightleftharpoons 2N{{H}_{3}}\left( g \right)\]  [NEET 2019]

    A) \[-\frac{d[{{N}_{2}}]}{dt}=\frac{1}{2}\frac{d[N{{H}_{3}}]}{dt}\]

    B) \[3\frac{d[{{H}_{2}}]}{dt}=2\frac{d[N{{H}_{3}}]}{dt}\]

    C) \[-\frac{1}{3}\frac{d[{{H}_{2}}]}{dt}=-\frac{1}{2}\frac{d[N{{H}_{3}}]}{dt}\]

    D) \[-\frac{d[{{N}_{2}}]}{dt}=2\frac{d[N{{H}_{3}}]}{dt}\]

    Correct Answer: A

    Solution :

    [a] \[{{N}_{2}}+3{{H}_{2}}\rightleftharpoons 2N{{H}_{3}}\]
              \[-\frac{d{{N}_{2}}}{dt}=-\frac{1}{3}\frac{d{{H}_{2}}}{dt}=+\frac{1}{2}-\frac{dN{{H}_{3}}}{dt}\]
              \[-\frac{d{{N}_{2}}}{dt}=+\frac{1}{2}\frac{d[N{{H}_{3}}]}{dt}\]


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