NEET Chemistry Enthalpy MCQ Question
Which of the following statements about enthalpy is correct?
The standard molar enthalpy of formation is the enthalpy change when one mole of a compound is formed from its constituent elements.
Enthalpy changes for all reactions are always negative, indicating that all reactions are exothermic.
Enthalpy of hydration is always negative, regardless of the salt being dissolved.
The enthalpy change for the dissolution of ionic compounds is always exothermic.
Correct Answer
Detailed Explanation
Statement A correctly describes the standard molar enthalpy of formation as defined in the NCERT context. Other statements misrepresent the nature of enthalpy changes in reactions.
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