JEE Main Chemistry · The d- and f-Block Elements

Spin-only Magnetism

Spin-only Magnetism (The d- and f-Block Elements) was asked 6 times in 6 JEE Main shifts, 2024–2026, out of the 42 shifts Lumi analysed. 3 of the 6 had a numerical answer.

Times asked: 6; in 6 shifts
Years: 2024–2026
Usual format: Numerical value; Multi-step
Pattern: New since 2024; repeats across shifts

How it is asked

Count paramagnetic ions
Ions with given unpaired electrons count

Difficulty

Easy 2Medium 4Hard 0

Where it sits

Chapter: The d- and f-Block Elements. Topic: d-Block Elements, 51 questions over 25 ideas.

All 6 questions

Newest first, each with its options and official answer.

2 Apr 2026, Shift 2 · Q74Number of paramagnetic ions among the following d- and f-block metal ions is __________.…MediumNumerical value
4 Apr 2026, Shift 2 · Q62Consider $|x|$ is the difference in oxidation states of Mn in highest manganese fluoride and highest manganese oxide. The ions with $|x|$ …MediumOther
3 Apr 2025, Shift 1 · Q62The metal ions that have the calculated spin-only magnetic moment value of 4.9 B.M. are : A. $\mathrm{Cr^{2+}}$ B. $\mathrm{Fe^{2+}}$ C.…EasyOther
8 Apr 2025, Shift 2 · Q58The correct decreasing order of spin only magnetic moment values (BM) of $\mathrm{Cu^+}$ , $\mathrm{Cu^{2+}}$ , $\mathrm{Cr^{2+}}$ and…EasySingle correct
6 Apr 2024, Shift 2 · Q86Among $\mathrm{VO_2^+}$ , $\mathrm{MnO_4^-}$ and $\mathrm{Cr_2O_7^{2-}}$ , the spin-only magnetic moment value of the species with least…MediumNumerical value
8 Apr 2024, Shift 1 · Q86The 'spin only' magnetic moment value of $\mathrm{MO_4^{2-}}$ is ____________ BM. (Where M is a metal having least metallic radii. among…MediumNumerical value