NEET Sample Paper NEET Sample Test Paper-50

  • question_answer 60) If \[\Delta {{H}_{f}}\] of \[{{C}_{2}}{{H}_{4}}\] and \[{{C}_{2}}{{H}_{6}}\] are \[{{x}_{1}}\,and\text{ }{{x}_{2}}\] \[Kcal\text{ }mo{{l}^{-1}}\], then heat of hydrogenation of \[{{C}_{2}}{{H}_{4}}\] is-

    A) \[{{\text{x}}_{1}}+{{x}_{2}}\]

    B)               \[{{x}_{1}}-{{x}_{2}}\]

    C) \[{{x}_{2}}-{{x}_{1}}\]                       

    D) \[{{x}_{1}}+2{{x}_{2}}\]

    Correct Answer: C

    Solution :

    \[~{{C}_{2}}{{H}_{4}}\,\,+\,\,{{H}_{2}}\,\,\to \,\,{{C}_{2}}{{H}_{6}}\] \[\Delta H=\left( \sum :H_{f}^{0} \right)-{{\left( \sum H_{f}^{0} \right)}_{R}}\] \[=\left( {{x}_{2}} \right)-\left( {{x}_{1}} \right)\]

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