NEET Physics (general) MCQ Question
Which of the following statements about enthalpy changes in thermodynamics is correct?
The enthalpy change for the formation of a compound from its elements is called standard molar enthalpy of formation.
Enthalpy changes are only applicable to reactions at absolute zero temperature.
The sum of enthalpy changes in a cyclic process is dependent on the path taken.
Ionization energy is defined as the energy released when an electron is added to an atom.
Correct Answer
Detailed Explanation
Statement A is correct as it describes the standard molar enthalpy of formation accurately. Statement B is incorrect because enthalpy changes apply at various temperatures, not just absolute zero. Statement C is wrong since enthalpy changes in a cycle are path-independent. Statement D inaccurately describes ionization energy, which is the energy required to remove an electron, not the energy released.
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