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CMC Medical CMC-Medical VELLORE Solved Paper-2013

  • question_answer
    \[{{H}_{2}}(g)+2NO\,(g)\rightleftharpoons {{N}_{2}}O(g)+{{H}_{2}}O\,(g)\,;\]\[{{K}_{c}}=1.4\times {{10}^{5}}\]at \[25{}^\circ C\] If the reaction mixture contains 0.05 M\[{{H}_{2}}(g),\]\[0.02\,M\,NO\,(g),\]\[5.4\,M\,{{N}_{2}}O\,(g)\] and \[8.7\,M{{H}_{2}}O\,(g)\] at some particular moment in time then we accurately predict that

    A)  the reaction is very close to equilibrium

    B)  the raction is very far to equilibrium

    C)  the reaction is at equilibrium

    D)  both the\[{{H}_{2}}(g)\]and\[NO(g)\]concentration must increase significantly to reach equilibrium

    Correct Answer: A

    Solution :

                    \[{{Q}_{c}}=\frac{[{{N}_{2}}O]\,[{{H}_{2}}O]}{[{{H}_{2}}]\,{{[NO]}^{2}}}=\frac{5.4\times 8.7}{0.05\times 0.02}=46.98\times {{10}^{3}}\] \[<{{K}_{c}}(140\times {{10}^{3}})\]i.e. reaction is close to equiblibrim


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