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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 13

  • question_answer
    For the process,\[{{H}_{2}}O(l)\]\[(1\,bar,\,373K)\]\[{{H}_{2}}{{O}_{(g)}}\](1 bar, 373 K), the correct set of thermodynamic parameters is

    A) \[\Delta G=0,\Delta S=+ve\]

    B) \[\Delta G=0,\Delta S=-ve\]

    C) \[\Delta G=+ve,\Delta S=0\]      

    D) \[\Delta G=-ve,\Delta S=+ve\]

    Correct Answer: A

    Solution :

    : The change given is occurring at the boiling point of the liquid, where, at given pressure and temperature, the liquid-vapour system virtually remains at equilibrium and hence, \[\Delta G=0\]. Also  due to absorption of heat as latent heat of vaporisation, or due to change from liquid to gaseous state where randomness has also increased, \[\Delta S>0\].


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