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JCECE Engineering JCECE Engineering Solved Paper-2005

  • question_answer
    For the reaction\[{{H}_{2}}(g)+{{I}_{2}}(g)2HI(g)\] the equilibrium constants expressed in terms of concentrations \[{{K}_{c}}\] and in terms of partial pressures\[{{K}_{p}},\]are related as:

    A) \[{{K}_{p}}={{K}_{c}}{{(RT)}^{2}}\]          

    B) \[{{K}_{p}}={{K}_{c}}{{(RT)}^{-2}}\]

    C) \[{{K}_{p}}={{K}_{c}}\]                  

    D)  \[{{K}_{c}}={{K}_{p}}(RT)\]

    Correct Answer: C

    Solution :

    Key Idea: \[{{K}_{c}}={{K}_{p}}{{(RT)}^{\Delta n}}\] Find value of \[\Delta n\] and substitute in formula to find relationship between \[{{K}_{c}}\] and \[{{K}_{p}}\].                 \[{{H}_{2}}(g)+{{I}_{2}}(g)2HI(g)\] \[\therefore \]  \[\Delta n=2-2=0\] \[\therefore \]  \[{{K}_{c}}={{K}_{p}}{{(RT)}^{o}}\] \[\therefore \]  \[{{K}_{c}}={{K}_{p}}\]


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