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JEE Main 2021 · ChemistryMultiple choiceSingle correctEasyConceptual

JEE Main 25 July 2021, Shift 2, Chemistry Q40

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

Which one of the following metal complexes is most stable ?

(1) $\mathrm{[Co(NH_3)_6]Cl_2}$
(2) $\mathrm{[Co(en)_3]Cl_2}$ Official answer
(3) $\mathrm{[Co(en)_2(NH_3)_2]Cl_2}$
(4) $\mathrm{[Co(en)(NH_3)_4]Cl_2}$

Official answer

Option 2

NTA final key.

Chapter: Coordination Compounds
Topic: No close match in our taxonomy
Idea tested: No close match in our taxonomy

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.