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

  • question_answer
    A reaction which is of first order w.r.t. reactant A, has a rate constant 6 \[{{\min }^{-1}}\]. If we start with \[\left[ A \right]=0.5\text{ }mol\text{ }{{L}^{-1}}\], when would [A] reach the value of \[0.05\text{ }mol\,{{L}^{-1}}\]

    A) 0.384 min          

    B) 0.15 min

    C) 3 min                            

    D) 3.84 min

    Correct Answer: A

    Solution :

    [a] \[t=\frac{2.303}{k}\log \frac{a}{a-x}\] \[=\frac{2.303}{6}\log \frac{0.5}{0.05}=0.384\,\min .\]


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