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NEET Sample Paper NEET Sample Test Paper-69

  • question_answer
    The rate constant, the activation energy and Arrhenius parameter of a chemical reaction at \[25{}^\circ C\] are \[3.0 \,\times \, 1{{0}^{-}}^{4}{{s}^{-}}^{1}, \,1044 kJ mo{{l}^{-}}^{1}\] and \[6.0\,\,\times \,\,{{10}^{14}}\,{{s}^{-1}}\] respectively. The value of the rate constant as \[T\to \infty \] is

    A) \[2.0\times {{10}^{18}}\,{{s}^{-1}}\]

    B) \[6.0\times {{10}^{14}}\,{{s}^{-1}}\]

    C) Infinity             

    D) \[3.6\times {{10}^{30}}\,{{s}^{-1}}\]

    Correct Answer: B

    Solution :

    The Arrhenius equation is \[K=A{{e}^{-Ea/RT}}\] As \[T\to \infty \,\,the\,\,value\,\,\frac{Ea}{RT}\to 0\] Therefore, \[{{e}^{-Ea/RT}}\to {{e}^{-\,0}}\Rightarrow 1\] Hence \[k\to A\] Hence \[k\,\,=\,\,6.0\times {{10}^{14}}{{s}^{-1}}\]


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