NEET Physics (general) MCQ Question
Which of the following statements about enthalpy change in thermodynamic processes is correct?
Enthalpy change is the difference between the total enthalpy of products and reactants in a chemical reaction.
Enthalpy change is always positive for spontaneous processes.
The enthalpy change of an endothermic reaction is represented by a negative value.
The enthalpy change for a reaction reflects the heat absorbed or released at constant volume only.
Correct Answer
Detailed Explanation
Enthalpy change, represented as ∆rH, is defined as the difference between the sum of enthalpies of products and reactants, indicating the heat exchanged during a reaction. In contrast, endothermic reactions have positive enthalpy changes, and the enthalpy change applies at constant pressure, not volume.
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