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NEET NEET SOLVED PAPER 2017

  • question_answer
    A first order reaction has a specific reaction rate of\[{{10}^{-2}}{{s}^{-1}}.\] How much time will it take for 20 g of the reactant to reduce to 5 g?                                                                                                                           

    A)  693.0 second

    B)         238.6 second

    C)  138.6 second

    D)         346.5 second

    Correct Answer: C

    Solution :

                     \[{{t}_{1/2}}=\frac{0.693}{{{10}^{-2}}}\]second For the reduction of 20 g of reactant to 5 g, two \[{{t}_{1/2}}\]is required.                 \[\therefore \]  \[t=2\times \frac{0.693}{{{10}^{-2}}}\,\text{seecond}\]                                 \[=138.6\,\text{second}\]


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