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JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank 2nd and 3rd law of thermodynamics and Entropy

  • question_answer
    The standard entropies of \[C{{O}_{2}}(g),\,C(s)\] and \[{{O}_{2}}(g)\] are 213.5, 5.690 and \[205\,J{{K}^{-1}}\] respectively. The standard entropy of formation of \[C{{O}_{2}}(g)\] is  [CPMT 2001]

    A)                 \[1.86\,J{{K}^{-1}}\]       

    B)                 \[1.96\,J{{K}^{-1}}\]

    C)                 \[2.81\,J{{K}^{-1}}\]       

    D)                 \[2.86\,J{{K}^{-1}}\]

    Correct Answer: C

    Solution :

           Formation of \[C{{O}_{2}}\]is,            \[{{C}_{(s)}}+{{O}_{2(g)}}\to C{{O}_{2(g)}}\]                                 \[\Delta {{S}^{o}}=213.5-5.690-205=2.81\,\,J{{K}^{-1}}\].


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