JEE Main & Advanced Sample Paper JEE Main Sample Paper-18

  • question_answer
    The velocity constant of a reaction at 280 K is\[1.6\times {{10}^{-4}}\]. The velocity constant of the same reaction at 300 K is

    A)  \[1.6\times {{10}^{-4}}\]                             

    B)  \[0.8\times {{10}^{-4}}\]

    C)  \[6.4\times {{10}^{-4}}\]                             

    D)  \[3.2\times {{10}^{-4}}\]

    Correct Answer: C

    Solution :

     The rate of reaction and therefore, velocity constant becomes double for every \[10{}^\circ \] rise in temperature. For \[20{}^\circ \] rise in temperature \['k'\] becomes four times i.e., \[4\times 1.6\times {{10}^{-4}}=6.4\times {{10}^{-4}}\].


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