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NEET Sample Paper NEET Sample Test Paper-57

  • question_answer
    For a first order reaction\[A\to B\], the reaction rate at reactant concentration of 0.01 M is found to be \[2.0\times 105\] mole\[{{L}^{-1\text{ }}}{{s}^{-1}}\]. The half-life of the reaction is:

    A) 300s                             

    B) 30s    

    C) 220s                             

    D) 347s

    Correct Answer: D

    Solution :

    [d] 347s Rate=k [A] i.e \[2.0\times {{10}^{-5}}=k(0.01)\] \[k=\frac{2.0\times 10-5}{0.01}\] \[k=2.0\times {{10}^{-3}}\] \[{{t}_{1/2}}=\frac{0.693}{k}=\frac{0.693}{2.0\times {{10}^{-3}}}=347s\]


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