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Uttarakhand PMT Uttarakhand PMT Solved Paper-2007

  • question_answer
    The reaction\[A\xrightarrow[{}]{{}}B\]follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 h. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?

    A)  1 h           

    B)  0.5 h

    C)  0.25 h         

    D)  2h

    Correct Answer: A

    Solution :

     In case I, fraction of A reacted \[=\frac{0.6}{0.8}=\frac{3}{4}\] In case II, fraction of A reacted \[=\frac{0.675}{0.9}=\frac{3}{4}\] For a first order reaction, time taken for the same fraction of reaction is independent of initial concentration.


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