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NEET Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Self Evaluation Test - Chemical Kinetics

  • question_answer
    The rate of a first order reaction is \[1.5\times {{10}^{-2}}mol\text{ }{{L}^{-1}}{{\min }^{-1}}\] at 0.5 M concentration of the reactant. The half-life of the reaction is

    A) 0.383 min

    B) 23.1 min

    C) 8.73 min         

    D) 7.53 min

    Correct Answer: B

    Solution :

    [b] For a first order reaction, \[A\to \] Products \[r=k[A]\,or\,k=\frac{r}{[A]}\] \[\Rightarrow k=\frac{1.5\times {{10}^{-2}}}{0.5}=3\times {{10}^{-2}}\] Further, \[{{t}_{1/2}}=\frac{0.693}{k}=\frac{0.693}{3\times {{10}^{-2}}}=23.1\]


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