NEET Chemistry Enthalpy MCQ Question
Which of the following statements about enthalpy is correct?
The standard enthalpy of vaporization is positive, indicating heat is absorbed during the phase change.
Lattice enthalpy can be directly measured using experimental methods.
Bond enthalpy is defined as the energy released when a bond is broken.
The enthalpy of sublimation is always less than the enthalpy of vaporization for a given substance.
Correct Answer
Detailed Explanation
The standard enthalpy of vaporization, ∆ vap H , is defined as the heat required to vaporize one mole of a liquid at its boiling point, and it is indeed a positive value, reflecting the absorption of heat. Other statements contain inaccuracies regarding enthalpy definitions.
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