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

  • question_answer
    For the combustion reaction at \[298\text{ }K\] \[2Ag\left( s \right)+1/2{{O}_{2}}\left( g \right)\xrightarrow{{}}2A{{g}_{2}}O\left( s \right)\] Which of the following alternatives is correct?

    A) \[\Delta H=\Delta U\]

    B) \[\Delta H>\Delta U\]

    C) \[\Delta H<\Delta U\]

    D) \[\Delta H\] and \[\Delta U\] has no relation with each other

    Correct Answer: C

    Solution :

    [c] \[\Delta H=\Delta U+\Delta nRT\] \[\Delta n={{n}_{p}}-{{n}_{R}}\] Now, \[\Delta n=2-\frac{5}{2}=-\frac{1}{2}\] \[\therefore \text{ }\Delta H=\Delta U-\frac{1}{2}RT\] Thus, \[\Delta U=\Delta H+\frac{1}{2}RT\] \[\therefore \text{ }\Delta U>\Delta H\]


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