Group 15 Elements — Predicted 2026

AI-Predicted Question Angles for UPSC 2026

Based on trend analysis, current affairs, and recurring themes in Group 15 Elements.

Comparative properties of nitrogen and phosphorus

high

The distinct differences between nitrogen and phosphorus, especially regarding their physical state, bonding capabilities ($p\pi-p\pi$ vs. single bonds), maximum covalency (due to d-orbitals), and hydrogen bonding, are fundamental to understanding Group 15. These differences are a classic area for conceptual questions in NEET, testing a student's grasp of anomalous behavior and its underlying causes. Expect questions comparing their allotropes, hydride properties, or halide formation.

Trends in thermal stability, basicity, and reducing character of Group 15 hydrides

high

The systematic trends observed in the properties of $EH_3$ hydrides (thermal stability, basicity, reducing character) are a perennial favorite for NEET. Questions often ask to arrange them in increasing or decreasing order, or to explain the reasons for a particular trend. Understanding the relationship between bond strength, atomic size, and electron density is key here. This topic directly tests the application of periodic trends.

Structure, basicity, and reducing nature of phosphorus oxoacids

medium

Questions on phosphorus oxoacids, particularly $H_3PO_2$, $H_3PO_3$, and $H_3PO_4$, are common. Students are often tested on their structures (number of P-H and P-OH bonds), their basicity (number of ionizable protons), and their reducing properties (due to P-H bonds). Misconceptions about the number of acidic hydrogens are frequently exploited in trap options. A clear understanding of their structures is vital.