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NEET Sample Paper NEET Sample Test Paper-46

  • question_answer
    For the reaction \[{{X}_{2}}{{O}_{4(l)}}\,\,\to \,\,2X{{O}_{2(g)}}\,\,\Delta E\,\,=\,\,2.1\] \[Kcal,\,\,\Delta s\,=\,20\,cal/K\] at 300 K. Hence \[\Delta \]G is -

    A) 2.7 Kcal

    B)                    -2.7 Kcal

    C)                    9.3 Kcal

    D)                    -9.3 Kcal

    Correct Answer: A

    Solution :

    \[\underset{(l)}{\mathop{{{X}_{2}}{{O}_{4}}}}\,~\,\,\to ~\,\,\underset{(g)}{\mathop{2X{{O}_{2}}}}\,\] \[\Delta H=\Delta E+\Delta ngRT\] \[=2.1+2\times \left( \frac{2}{1000} \right)\times 300\] \[=2.1+1.2\] \[=\text{ }3.3\text{ }Kcal\] \[\Delta G=\Delta H-T\Delta S\] \[=3.3\,\,-\,\,300\,\times \,\,\frac{20}{1000}\] \[=2.7\text{ }Kcal.\]


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