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NEET Sample Paper NEET Sample Test Paper-79

  • question_answer
    \[{{H}_{2}}O\,(s)\,\,\rightleftharpoons \,\,{{H}_{2}}O\,(l)\] The water and ice is at equilibrium at 273K and enthalpy change of process is \[6\text{ }kJ\text{ }mo{{l}^{-\,1}}\]. The entropy change of conversion of ice into liquid water is

    A)  \[21.98 J{{K}^{-1}} {{W}^{-1}}\]     

    B)  \[-\,21.98 J{{K}^{-1}} {{W}^{-1}}\]

    C)  \[-\,21.98 J{{K}^{-1}}\]          

    D)  \[+\,21.98 J{{K}^{-1}}\]

    Correct Answer: A

    Solution :

    We know that \[\Delta {{S}_{fus}}=\frac{\Delta {{H}_{fus}}}{{{T}_{m}}}=\frac{6000\,J}{273\,K}\,mo{{l}^{-\,1}}\] \[=\,\,\,21.98\,\,J{{K}^{-}}^{1}mo{{l}^{-1}}\]


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