Properties of Ionic Compounds — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Properties of Ionic Compounds.

Comparative Analysis of Lattice Energy and Hydration Energy for Solubility

high

NEET often tests the application of fundamental principles. A question comparing the solubility of a series of ionic compounds (e.g., Group 2 sulfates or halides) and asking for the least/most soluble, with reasoning based on the relative magnitudes of lattice energy and hydration energy, is highly probable. This requires students to understand how ionic size and charge affect both energy terms and their delicate balance for dissolution. For instance, explaining why $BaSO_4$ is insoluble while $MgSO_4$ is soluble.

Impact of Ionic Charge on Melting Point and Hardness

medium

Questions emphasizing the dominant effect of ionic charge over ionic size on lattice energy and, consequently, on melting point and hardness are common. A question might present compounds like $NaCl$, $MgCl_2$, and $Al_2O_3$ and ask for their increasing order of melting points, forcing students to consider the $q_1 q_2$ factor. The transition from purely ionic to partially covalent character (e.g., $AlCl_3$) could also be a subtle trap.

Distinguishing Conductivity in Different States with Explanations

high

The electrical conductivity of ionic compounds in solid, molten, and aqueous states is a classic and frequently tested concept. A question might involve a scenario where an ionic compound is subjected to different conditions, and its conductivity is measured. Students will need to explain the observations based on the mobility of ions. This angle is fundamental and directly assesses a core property of ionic compounds.