Physics-(general)
NEET Physics (general) MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Which of the following combinations about enthalpy changes in thermodynamics is correct?
A
A positive ∆rH indicates an endothermic reaction; the reaction absorbs heat.
B
A negative ∆rH indicates an endothermic reaction; the reaction releases heat.
C
The enthalpy change, ∆rH, is independent of the physical state of the reactants and products.
D
Enthalpy changes can vary with temperature, affecting the spontaneity of reactions.
Correct Answer
Option A
Detailed Explanation
A positive ∆rH indeed indicates that the reaction is endothermic, meaning it absorbs heat. This is aligned with the description of thermochemical equations where enthalpy changes are specified and the signs indicate the nature of the reaction.
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