BCECE Engineering BCECE Engineering Solved Paper-2011

  • question_answer
    The equilibrium constants for the reactions \[{{N}_{2}}+3{{H}_{2}}2N{{H}_{3}}\]                 and        \[\frac{1}{2}{{N}_{2}}+\frac{3}{2}{{H}_{2}}N{{H}_{3}}\] are\[{{K}_{1}}\]and \[{{K}_{2}}\]respectively. Which one of the following is the correct relationship?

    A) \[{{K}_{1}}=2{{K}_{2}}\]

    B)         \[{{K}_{1}}=\frac{1}{2}{{K}_{2}}\]            

    C)         \[{{K}_{2}}=\sqrt{{{K}_{1}}}\]   

    D)         \[{{K}_{1}}={{K}_{2}}\]

    Correct Answer: C

    Solution :

    \[{{N}_{2}}+3{{H}_{2}}2N{{H}_{3}}\] \[{{({{K}_{C}})}_{1}}=\frac{{{[N{{H}_{3}}]}^{2}}}{[{{N}_{2}}]{{[{{H}_{2}}]}^{3}}}\]                                ?(i)                                 \[\frac{1}{2}{{N}_{2}}+\frac{3}{2}{{H}_{2}}N{{H}_{3}}\]                 \[{{({{K}_{C}})}_{2}}=\frac{[N{{H}_{3}}]}{{{[{{N}_{2}}]}^{1/2}}{{[{{H}_{2}}]}^{3/2}}}\]                                       ?(ii) From Eqs. (i) and (ii), we get \[\frac{{{({{K}_{C}})}_{1}}}{({{K}_{C}})_{2}^{2}}=1\] \[{{({{K}_{C}})}_{2}}={{\sqrt{({{K}_{C}})}}_{1}}\]


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