JCECE Medical JCECE Medical Solved Paper-2008

  • question_answer
    What is the equilibrium expression for the reaction, \[{{P}_{4}}(s)+5{{O}_{2}}(g){{P}_{4}}{{O}_{10}}(s)?\]

    A)  \[{{K}_{c}}=\frac{[{{P}_{4}}{{O}_{10}}]}{[{{P}_{4}}]{{[{{O}_{2}}]}^{5}}}\]

    B)  \[{{K}_{c}}=\frac{[{{P}_{4}}{{O}_{10}}]}{5[{{P}_{4}}][{{O}_{2}}]}\]

    C)  \[{{K}_{c}}={{[{{O}_{2}}]}^{5}}\]

    D)  \[{{K}_{c}}=\frac{1}{{{[{{O}_{2}}]}^{5}}}\]

    Correct Answer: D

    Solution :

     In the expression for equilibrium constant (\[{{K}_{p}}\]or\[{{K}_{c}}\]) species in solid state are not written (ie, their molar concentrations are taken as 1) \[{{P}_{4}}(s)+5{{O}_{2}}{{P}_{4}}{{O}_{10}}(s)\] Thus, \[{{K}_{c}}=\frac{1}{{{[{{O}_{2}}]}^{5}}}\]


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