JEE Main & Advanced Chemistry Chemical Kinetics / रासायनिक बलगतिकी Sample Paper Topic Test - Chemical Kinetics

  • question_answer
    In a first-order reaction, the reacting substance has half-life period of 10 min. What fraction of the substance will be left after an hour the reaction has occurred?

    A) 1/6 of initial concentration      

    B) 1/64 of initial concentration

    C) 1/12 of initial concentration     

    D) 1/32 of initial concentration

    Correct Answer: B

    Solution :

    \[{{t}_{1/2}}=10;\] Number of half-life \[=\frac{60}{10}=6=\] half-life \[{{C}_{t}}=\frac{{{C}_{0}}}{{{\left( 2 \right)}^{n}}}=\frac{{{C}_{0}}}{{{\left( 2 \right)}^{6}}}=\left( \frac{{{C}_{0}}}{64} \right)\]

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