Spontaneity — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

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

Combined effect of $\Delta H$, $\Delta S$, and $T$ for spontaneity

high

This is the core of spontaneity. Questions testing the qualitative and quantitative understanding of how $\Delta H$, $\Delta S$, and temperature interact to determine the sign of $\Delta G$ are fundamental. Expect scenarios where students need to identify the temperature range for spontaneity or predict spontaneity based on given signs. This angle allows for both conceptual and numerical problems, making it highly versatile for NEET.

Distinction between spontaneity and reaction rate

high

This is a classic conceptual trap that frequently appears in NEET. Many students confuse these two independent concepts. Questions will likely involve identifying incorrect statements or choosing the correct explanation for why a spontaneous reaction might be slow. Reinforcing this distinction is crucial for avoiding common errors and is a reliable way for examiners to test fundamental understanding.

Calculation of equilibrium constant ($K$) from $\Delta G^circ$

medium

The relationship $\Delta G^circ = -RT \ln K$ is a direct application of spontaneity principles to equilibrium. While it involves a bit more calculation (logarithms/exponentials), it's a standard type of problem. NEET often includes such calculations to test both thermodynamic knowledge and mathematical proficiency. Expect problems where $\Delta G^circ$ is given and $K$ needs to be found, or vice-versa, often requiring careful unit conversions.

Spontaneity of phase transitions

medium

Phase transitions (melting, freezing, boiling, condensation) provide excellent real-world examples where $\Delta H$ and $\Delta S$ have predictable signs, and temperature plays a clear role in spontaneity. Questions might ask about the spontaneity of melting ice at different temperatures or the signs of $\Delta H$ and $\Delta S$ for a given phase change, making it a good test of applying the Gibbs equation to physical processes.