Classification of Elements and Periodicity in Properties
Previous year questions with solutions · 2024 – 2026
55 Questions
49 Papers covered
4.21% Weightage 2026 ▲ 25% vs last year
Year-wise statistics questions · papers · average per paper · weightage Year Questions Papers Avg / paper Weightage 2026 20 19 1.1 4.21% ▲ 25% vs last year 2025 16 19 0.84 3.37% ▲ 6.5% vs last year 2024 19 21 0.9 3.16%
All 55 MCQ 48 Matching 4 Numerical 3 Topic All topics Atomic Radius and Ionic Radius Development of Periodic Table Electron Gain Enthalpy Electronegativity Ionisation Enthalpy Metallic and Non-Metallic Character Modern Periodic Table, Long Form of Periodic Table and IUPAC Names of Elements (Z > 100) Nature of Oxides Period, Group and Block Valency Year All years 2026 2025 2024
Ques. 1 JEE Main 2026, 6 April (Morning Shift)
First and second ionization enthalpies of lithium are 520 kJ mol-1 and 7297 kJ mol-1 respectively. Energy required to convert 3.5 mg lithium (g) into Li2+(g) [ Li(g) Li2+(g)] is kJ. (nearest integer) [Molar mass of Li = 7 g mol-1]