JCECE Engineering JCECE Engineering Solved Paper-2003

  • question_answer
    The unit of rate constant for 1st order reaction is:

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

    B) \[mo{{l}^{-1}}L{{s}^{-1}}\]

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

    D)  \[mo{{l}^{2}}{{L}^{-2}}{{s}^{-1}}\]

    Correct Answer: C

    Solution :

    Key Idea: For reaction of nth order                 \[k=\frac{1}{time}\times \frac{1}{{{(conc.)}^{n-1}}}\] For first order reaction\[n=1\] \[\therefore \]  \[k=\frac{1}{time}\times \frac{1}{{{(conc.)}^{1-1}}}=\frac{1}{time}=tim{{e}^{-1}}\]                                                                      \[={{s}^{-1}}\]


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