J & K CET Medical J & K - CET Medical Solved Paper-2000

  • question_answer
    If the concentration is expressed in mole per litre, the unit of rate constant for a first order reaction is:

    A)  \[mol\,{{L}^{-1}}\]                         

    B)  \[L\text{ }mo{{l}^{-1}}\]

    C)  \[{{s}^{-1}}\]                                    

    D)  \[mol\,{{L}^{-1}}\,{{s}^{-1}}\]

    Correct Answer: C

    Solution :

                    For first order reaction: \[Rate=\frac{dx}{dt}k[A]\]                 \[k=\frac{mol\,{{L}^{-1}}{{s}^{-1}}}{mol\,{{L}^{-1}}}={{s}^{-1}}\] Hence, for first order reaction unit of rate constant is\[se{{c}^{-1}}\].


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