JEE Main & Advanced Chemistry Thermodynamics / रासायनिक उष्मागतिकी Question Bank First law of thermodynamics and Hess law

  • question_answer
    The enthalpies of the elements in their standard states are assumed to be

    A)                 Zero at 298 K

    B)                 Unit at 298 K

    C)                 Zero at all temperatures

    D)                 Zero at 273 K

    Correct Answer: A

    Solution :

              The enthalpies of all elements in their standard state at \[{{25}^{o}}C\]or 298K are zero.


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