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

  • question_answer
    For reaction a \[A\to x\ P\], when \[[A]=2.2\ mM\], the rate was found to be \[2.4\ mM\ {{s}^{-1}}\]. On reducing concentration of A to half, the rate changes to \[0.6\ mM\ {{s}^{-1}}\]. The order of reaction with respect to A is                 [AIIMS 2005]

    A)                 1.5         

    B)                 2.0

    C)                 2.5         

    D)                 3.0

    Correct Answer: B

    Solution :

               aA ® xP                    Rate of reaction = [A]a                    Order of reaction = a                    [A]1 = 2.2 mM, r1 = 2.4 m M s?1                                       ...(i)                    [A]2 = 2.2/2 mM, r1 = 0.6 m M s?1 or, \[\frac{2.4}{4}\]    ...(ii)                    On reducing the concentration of A to half, the rate of reaction is decreased by four times.                    Rate of reaction = [A]2                                 Order of reaction = 2.


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