Acids, Bases and Salts — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Acids, Bases and Salts.

pH of very dilute solutions

high

This is a classic trap for students who forget to consider the autoionization of water when acid/base concentrations are $10^{-7},M$ or lower. NEET often includes such questions to test a deeper understanding beyond direct formula application. It differentiates students who apply principles rigorously from those who merely memorize formulas. Expect questions asking for pH of $10^{-8},M$ $HCl$ or $NaOH$ solutions.

Buffer capacity and effectiveness

medium

While Henderson-Hasselbalch is common, questions might delve into buffer capacity – how much acid/base a buffer can neutralize before its pH changes significantly. This involves understanding the concentrations of the weak acid/base and its conjugate. Questions could ask to identify the best buffer for a specific pH range or calculate the change in pH after adding a certain amount of strong acid/base to a buffer.

Identifying Lewis acids/bases in complex reactions

medium

Beyond simple examples like $BF_3$ and $NH_3$, NEET could present reactions involving transition metal ions forming coordination complexes or organic reactions where electron-pair donation/acceptance is key. This tests the broadest definition of acids and bases and its applicability in diverse chemical scenarios, linking to other chapters like coordination chemistry or organic reactions.

Hydrolysis of salts of weak acid and weak base

medium

While salts of strong-weak combinations are common, questions on salts of weak acid and weak base (e.g., $CH_3COONH_4$) are slightly more complex as both ions hydrolyze. Predicting the pH requires comparing $K_a$ of the acid and $K_b$ of the base. This tests a more nuanced understanding of hydrolysis and equilibrium constants.