CBSE · Class 11 · Chemistry · Chemical ThermodynamicsFor an exothermic reaction, the sign of the enthalpy change ($\Delta H$) is always:
Step-by-Step Solution
In exothermic reactions, heat is evolved from the system to the surroundings. Therefore, the total enthalpy of products is less than that of reactants, making $\Delta H$ negative.
Detailed Options Breakdown
Option : Positive
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Chemical Thermodynamics.
Option 1: Negative (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 2: Zero
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Chemical Thermodynamics.
Option 3: Undefined
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Chemical Thermodynamics.
💡 Study Guide: This question tests core syllabus concepts from Chemical Thermodynamics. For formulas, key summaries, and mock exam reference guides, read the full Chemical Thermodynamics Revision Notes.