JEE Main 2025 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 8 April 2025, Shift 2, Chemistry Q58

Question 58 of 75 in this shift, Chemistry question 8 of 25, Section A.

The correct decreasing order of spin only magnetic moment values (BM) of

\mathrm{Cu^+}

\mathrm{Cu^{2+}}

\mathrm{Cr^{2+}}

and

\mathrm{Cr^{3+}}

ions is :

(1) $\mathrm{Cr^{3+} > Cr^{2+} > Cu^+ > Cu^{2+}}$
(2) $\mathrm{Cu^+ > Cu^{2+} > Cr^{3+} > Cr^{2+}}$
(3) $\mathrm{Cr^{2+} > Cr^{3+} > Cu^{2+} > Cu^+}$ Official answer
(4) $\mathrm{Cu^{2+} > Cu^+ > Cr^{2+} > Cr^{3+}}$

Official answer

Option 3

NTA final key.

Chapter: The d- and f-Block Elements
Topic: d-Block Elements
Idea tested: Spin-only Magnetism

Same idea in other shifts

Asked 6× in all

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Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 42 of the 174 JEE Main shifts held from 2017 to 2026.