Latent Heat — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

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

Multi-stage calorimetry problem with ice and steam

high

NEET frequently tests the ability to combine specific heat and latent heat calculations across multiple phases. A problem involving ice at a sub-zero temperature, mixed with steam at above $100^circ ext{C}$, requiring the calculation of the final temperature or the amount of water/ice/steam at equilibrium, is a classic and comprehensive test of this topic. It checks understanding of $Q=mcDelta T$ for three phases (ice, water, steam) and $Q=mL$ for two phase changes (melting, vaporization/condensation).

Conceptual question on the energy transformation during phase change

medium

Questions probing the fundamental reason why temperature remains constant during a phase change (i.e., energy going into potential energy/intermolecular forces rather than kinetic energy) are common. This tests a deeper understanding beyond just formula application. It might involve comparing the energy states of molecules in different phases or explaining real-world phenomena like the cooling effect of evaporation.

Interpretation of a complex heating curve

medium

A heating curve showing multiple phase transitions (e.g., solid to liquid to gas) with varying slopes and plateaus can be presented. Students might be asked to identify the melting/boiling points, calculate the specific heat capacities of different phases from the slopes, or determine the latent heats from the lengths of the plateaus. This tests graphical interpretation skills combined with quantitative analysis of heat transfer.