Enthalpy — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Enthalpy.

Combined application of Hess's Law and $\Delta H = \Delta U + \Delta n_g RT$

high

NEET often tests the ability to integrate multiple concepts. A question might provide reaction enthalpies and ask for $\Delta U$ of a target reaction, requiring students to first use Hess's Law to find $\Delta H_{rxn}$ and then apply $\Delta H = \Delta U + \Delta n_g RT$. This tests both algebraic manipulation and thermodynamic relationships, making it a comprehensive and challenging problem type.

Enthalpy changes in biological systems or everyday phenomena

medium

While direct biological examples are less common, NEET is increasingly moving towards application-based questions. A question might describe a process like photosynthesis or respiration (simplified) or the working of an instant cold/hot pack, and ask about the sign of $\Delta H$ or the nature of the process (exothermic/endothermic). This tests conceptual understanding in a real-world context.

Graphical representation of enthalpy changes

low

Though less frequent, questions involving energy profile diagrams (reaction coordinate vs. enthalpy) to depict exothermic or endothermic reactions, activation energy, and overall $\Delta H$ could appear. This tests visual interpretation and conceptual understanding of energy landscapes. Students might be asked to identify $\Delta H$ from a given diagram or match a reaction type to its energy profile.