NEET Chemistry Enthalpy MCQ Question
Which of the following statements about standard molar enthalpy of formation (∆fH°) is correct?
The standard molar enthalpy of formation is defined as the enthalpy change when one mole of a compound is formed from its elements in their most stable states.
The standard molar enthalpy of formation is always negative for all compounds, indicating that energy is released in all formation reactions.
The reference state of an element is its least stable state at 25°C and 1 bar pressure.
Mean bond enthalpies are calculated from the enthalpy changes of formation of compounds only at high temperatures.
Correct Answer
Detailed Explanation
The standard molar enthalpy of formation (∆fH°) is defined as the enthalpy change when one mole of a compound is formed from its elements in their most stable states of aggregation, as stated in the NCERT context.
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