JEE Main & Advanced Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Mock Test - Chemical Kinetics

  • question_answer
    The rate law of a reaction \[A\text{ }+\text{ }B\text{ }\to \]Product is rate =\[k{{[A]}^{n}}\]\[{{[B]}^{n}}\] On doubling the concentration of A and halving the concentration of B, the ratio of new rate to the earlier rate of reaction will be

    A) \[n-m\]  

    B) \[{{2}^{n-m}}\]

    C) \[\frac{1}{{{2}^{m+n}}}\]     

    D) \[m+n\]

    Correct Answer: B

    Solution :

    [b] \[\text{Rat}{{\text{e}}_{1}}=K{{[A]}^{n}}{{[B]}^{m}};\,\,\text{Rat}{{\text{e}}_{2}}=K{{[2A]}^{n}}{{\left[ \frac{1}{2}B \right]}^{m}}\]\[\therefore \frac{Rat{{e}_{2}}}{Rat{{e}_{1}}}=\frac{K{{[2A]}^{n}}{{\left[ \frac{1}{2}B \right]}^{m}}}{K{{[A]}^{n}}{{[B]}^{m}}}\] \[={{(2)}^{n}}{{\left( \frac{1}{2} \right)}^{m}}={{2}^{n}}\cdot {{2}^{-m}}={{2}^{n-m}}\]


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