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

  • question_answer
    The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is                                                [CBSE PMT 2005]

    A) - 1         

    B) - 2

    C) 1             

    D) 2

    Correct Answer: B

    Solution :

    \[R=k\,{{[B]}^{n}}\]; \[\frac{1}{4}R=k{{[2B]}^{n}}\];\[4={{\left( \frac{1}{2} \right)}^{n}}\]; \[4={{2}^{-n}}\]; \[n=-2\].


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