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NEET Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank Self Evaluation Test - Thermodynamics

  • question_answer
    If bond enthalpies of \[N\equiv N,\text{ }H-H\] and \[N-H\] bonds are \[{{x}_{1}},{{x}_{2}}\] and \[{{x}_{3}}\] respectively, \[\Delta H_{f}^{o}\] for \[N{{H}_{3}}\] will be

    A) \[{{x}_{1}}+3{{x}_{2}}-6{{x}_{3}}\]             

    B) \[1/2{{x}_{1}}+3/2{{x}_{2}}-3{{x}_{3}}\]

    C) \[3{{x}_{3}}-1/2{{x}_{1}}-3/2{{x}_{2}}\]

    D) \[6{{x}_{3}}-{{x}_{1}}-3{{x}_{2}}\]

    Correct Answer: B

    Solution :

    \[\frac{1}{2}{{N}_{2}}+\frac{3}{2}{{H}_{2}}\xrightarrow{{}}N{{H}_{3}}\]  \[\frac{1}{2}{{x}_{1}}+\frac{3}{2}{{x}_{2}}-3{{x}_{3}}\]


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