JEE Main & Advanced Chemistry Chemical Kinetics / रासायनिक बलगतिकी Question Bank Critical Thinking Chemical Kinetics

  • question_answer
    A Substance undergoes first order decomposition. The decomposition follows two parallel first order reactions as The percentage distribution of B and C are [Kerala PMT 2004]

    A)                 75% B and 25% C             

    B)                 80% B and 20% C

    C)                 60% B and 40% C             

    D)                 90% B and 10% C

    E)                 76.83% B and 23.17% C

    Correct Answer: E

    Solution :

               % distribution of \[B=\frac{{{K}_{1}}}{{{K}_{1}}+{{K}_{2}}}\times 100\]                    \[=\frac{1.26\times {{10}^{-4}}}{1.26\times {{10}^{-4}}+3.8\times {{10}^{-4}}}\times 100\]                    \[B%=76.83%\]                    \[%\text{Distribution of }C=\frac{{{K}_{2}}}{{{K}_{1}}+{{K}_{2}}}\times 100\] \[=\frac{3.8\times {{10}^{-4}}}{1.26\times {{10}^{-4}}+3.8\times {{10}^{-4}}}\times 100\]                                 \[C%=23.17%\]  


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