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NEET Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Self Evaluation Test - Chemical Kinetics

  • question_answer
    The reaction of \[{{A}_{2}}\] and \[{{B}_{2}}\] follows the equation \[{{A}_{2}}(g)+{{B}_{2}}(g)\to 2AB(g)\] The following data were observed
    \[{{[{{A}_{2}}]}_{0}}\] \[{{[{{B}_{2}}]}_{0}}\] Initial rate of appearance of \[AB(g)\,(in\,M{{s}^{-1}})\]
    0.10 0.10 \[2.5\times {{10}^{-4}}\]
    0.20 0.10 \[5\times {{10}^{-4}}\]
    0.20 0.20 \[10\times {{10}^{-4}}\]
    The value of rate constant for the above reaction is:

    A) \[2.5\times {{10}^{-4}}\]

    B) \[2.5\times {{10}^{-2}}\]

    C) \[1.25\times {{10}^{-2}}\]        

    D) None of these

    Correct Answer: C

    Solution :

    [c] Order w.r.t. A = 1; order w.r.t. B = 1 \[Rate=\frac{1}{2}\frac{d(AB)}{dt}={{K}_{r}}[A][B];\] \[\frac{1}{2}\times \left( 2.5\times {{10}^{4}} \right)={{k}_{r}}\left( 0.1)(0.1 \right)\] \[{{k}_{r}}=1.25\times {{10}^{-2}}\]


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