NEET Sample Paper NEET Sample Test Paper-32

  • question_answer The enthalpy of combustion of cyclohexane, cyclohexene and \[{{H}_{2}}\] are respectively \[-3920,-3800\]and\[-241\text{ }kJ\text{ }mo{{l}^{-1}}\]. The heat of hydrogenation of cyclohexene is :-

    A)  \[-121\text{ }kJ\text{ }mo{{l}^{-1}}\]     

    B)  \[+121\text{ }kJ\text{ }mo{{l}^{-1}}\]

    C)  \[-242\text{ }kJ\text{ }mo{{l}^{-1}}\]     

    D)  \[+242\text{ kJ mo}{{\text{l}}^{-1}}\]

    Correct Answer: A

    Solution :

    \[\Delta H=\sum{{{(\Delta {{H}_{combustion}})}_{\operatorname{Re}ac\tan t}}-\sum{{{(\Delta {{H}_{combusion}})}_{\Pr oduct}}}}\] \[=(-3800-241)-(-3920)=-121kJ\,mo{{l}^{-1}}\]

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