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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 13

  • question_answer
    For a reaction \[\frac{1}{2}a\xrightarrow[{}]{{}}2B\], rate of disappearance of A is related to rate of appearance of B by the expression

    A) \[\frac{-d[A]}{dt}=\frac{1}{4}\frac{d[B]}{dt}\]

    B) \[\frac{-d[A]}{dt}=4\frac{d[B]}{dt}\]

    C) \[\frac{-d[A]}{dt}=\frac{1}{2}\frac{d[B]}{dt}\]

    D) \[\frac{-d[A]}{dt}=\frac{d[B]}{dt}\]

    Correct Answer: A

    Solution :

    : \[\frac{1}{2}A\xrightarrow[{}]{{}}2B\]\[-\frac{1}{1/2}\frac{d[A]}{dt}=\frac{1}{2}\frac{d[B]}{dt}\] or\[-\frac{2d[A]}{dt}=\frac{1}{2}\frac{d[B]}{dt}\Rightarrow \frac{-d[A]}{dt}=\frac{1}{4}\frac{d[B]}{dt}\]


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