JEE Main & Advanced Chemistry Equilibrium Question Bank Activation energy, Standard free energy and Degree of dissociation and Vapour density

  • question_answer                                                                \[\Delta {{G}^{0}}(HI,\,g)\cong +1.7\,kJ\] . What is the equilibrium constant  at                                                                                          \[{{25}^{o}}C\]  for                                                                                               \[2HI(g)\]  D                                                                             \[{{H}_{2}}(g)+{{I}_{2}}(g)\]                 [KCET 1992]

    A)                 24.0       

    B)                 3.9

    C)                 2.0         

    D)                 0.5

    Correct Answer: D

    Solution :

           \[\Delta {{G}^{o}}=-2.303\times 8.314\times {{10}^{-3}}\times 298\,\,\log \,{{K}_{p}}\]                    \[1.7=-2.303\times 8.314\times {{10}^{-3}}\times 298\times \log \,{{K}_{p}}\]                                 \[{{K}_{p}}=0.5\]

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