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NEET Sample Paper NEET Sample Test Paper-23

  • question_answer
    The entropy values (in\[J{{K}^{-1}}mo{{l}^{-1}}\]) of \[{{H}_{2(g)}}=130.6,\]and \[HC{{l}_{(g)}}=186.7\]at 298 K and 1 atm pressure. Then entropy change for the reaction: \[{{H}_{2(g)}}+C{{l}_{2(g)}}\to 2HC{{l}_{(g)}}\]is

    A)  +450.3                      

    B)  +235.4

    C)  -156.7                        

    D)  +19.8

    Correct Answer: D

    Solution :

    \[\Delta {{S}^{o}}=2{{S}^{o}}_{HCl}-({{S}^{o}}_{{{H}_{2}}}+{{S}^{o}}_{C{{l}_{2}}})\] \[=2\times 186.7-(130.6+223.0)\] \[=19.8\,J{{K}^{-1}}\,mo{{l}^{-1}}\] Hence, the correct option is [d].


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