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KVPY Sample Paper KVPY Stream-SX Model Paper-15

  • question_answer
    The rate constant of the reaction \[A\to B\] is \[0.6\times {{10}^{-\,3}}mol{{e}^{-\,1}}\]per second. If the concentration of A is 5 M then concentration of B after 20 min is

    A) 1.08 M

    B) 3.60 M

    C) 0.36 M

    D) 0.72 M

    Correct Answer: D

    Solution :

    For a zero order reaction, unit of rate constant is mole \[{{L}^{-1}}{{s}^{-1}}.\]Hence, we can easily calculate concentration of B after 20 minutes by the following formula \[x=kt\] \[x=kt=0.6\times {{10}^{-\,3}}\times 20\times 60=0.72\,M\]


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