JEE Main 2022 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 25 July 2022, Shift 1, Chemistry Q86

Question 86 of 90 in this shift, Chemistry question 26 of 30, Section B.

Consider the following metal complexes :

[\mathrm{Co(NH_3)_6}]^{3+}

[\mathrm{CoCl(NH_3)_5}]^{2+}

[\mathrm{Co(CN)_6}]^{3-}

[\mathrm{Co(NH_3)_5(H_2O)}]^{3+}

The spin-only magnetic moment value of the complex that absorbs light with shortest wavelength is ______ B.M. (Nearest integer)

Official answer

NTA final key (2022 Session 2).

Chapter: Coordination Compounds
Topic: Crystal Field Theory
Idea tested: Color and d-d Transitions

Same idea in other shifts

Asked 3× in all

3 Apr 2025, Shift 1 · Q63The correct order of the complexes $\mathrm{[Co(NH_3)_5(H_2O)]^{3+}}$ (A), $\mathrm{[Co(NH_3)_6]^{3+}}$ (B), $\mathrm{[Co(CN)_6]^{3-}}$ …MediumSingle correct
16 Mar 2021, Shift 2 · Q59 $\mathrm{[Ti(H_2O)_6]^{3+}}$ absorbs light of wavelength 498 nm during a d-d transition. The octahedral splitting energy for the above…EasyNumerical value

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.