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BHU PMT BHU PMT (Mains) Solved Paper-2009

  • question_answer
    Dissolution of ammonium chloride in water leads to a cooling sensation. At constant temperature, this process is accompanied by

    A)  increase in entropy

    B)  decrease in entropy

    C)   decrease in enthalpy

    D)  no change in entropy

    Correct Answer: A

    Solution :

                     Since, cooling is produced, the reaction is endothermic, ie,\[\Delta H=+ve\]. \[\Delta G=\Delta H-T\Delta S,\][For spontaneous process\[\Delta G=-\text{ }ve\]] As the value of AH is positive, the value of\[\Delta S\] must be positive to get a negative value of\[\Delta G\]. Thus, the process is accompanied by increase in entropy.


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