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JEE Main & Advanced Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Rate law and Rate Constant

  • question_answer
    If a substance with half life 3 days is taken at other place in 12 days. What amount of substance is left now           [AFMC 2005]

    A)                 1/4        

    B)                 1/8

    C)                 1/16      

    D)                 1/32

    Correct Answer: C

    Solution :

               \[T={{t}_{1/2}}\times n\] i.e. \[12=3\times n\Rightarrow n=4\]                                 \[N={{N}_{0}}{{\left( \frac{1}{2} \right)}^{n}}\Rightarrow \frac{N}{{{N}_{0}}}={{\left( \frac{1}{2} \right)}^{4}}=\frac{1}{16}\]


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