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JEE Main 2021 · ChemistryMultiple choiceSingle correctMediumApplication

JEE Main 26 August 2021, Shift 2, Chemistry Q40

Question 40 of 90 in this shift, Chemistry question 10 of 30, Section A.

Indicate the complex/complex ion which did not show any geometrical isomerism :

(1) $[\mathrm{CoCl_2(en)_2}]$
(2) $[\mathrm{Co(CN)_5\ (NC)}]^{3-}$ Official answer
(3) $[\mathrm{Co(NH_3)_4\ Cl_2}]^+$
(4) $[\mathrm{Co(NH_3)_3\ (NO_2)_3}]$

Official answer

Option 2

NTA final key.

Chapter: Coordination Compounds
Topic: Coordination Isomerism
Idea tested: Octahedral Geometrical

Same idea in other shifts

Asked 2× in all

8 Apr 2025, Shift 2 · Q59Given below are two statements: Statement I : A homoleptic octahedral complex, formed using monodentate ligands, will not show…MediumTwo statements

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 108 of the 174 JEE Main shifts held from 2017 to 2026.