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JEE Main & Advanced Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Rate law and Rate Constant

  • question_answer
    For a first order reaction \[A\to B\] the reaction rate at reactant concentration of \[0.01M\] is found to be \[2.0\times {{10}^{-5}}mol\ {{L}^{-1}}{{s}^{1}}\]. The half life period of the reaction is [CBSE PMT 2005]

    A)                 220 s     

    B)                 30 s

    C)                 300 s     

    D)                 347 s

    Correct Answer: D

    Solution :

               \[R=K[A]\]                     \[2\times {{10}^{-5}}=K\times {{10}^{-2}}\]                     \[K=2\times {{10}^{-3}}\,{{\sec }^{-1}}\]                                 \[{{t}_{1/2}}=\frac{.693}{K}=\frac{.693}{2\times {{10}^{-3}}}=\frac{693}{2}=347\,\sec \]


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