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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceSingle correctMediumMulti-step

JEE Main 9 January 2020, Shift 1, Chemistry Q38

Question 38 of 75 in this shift, Chemistry question 13 of 25, Section A.

[Pd(F)(Cl)(Br)(I)]2−[\mathrm{Pd(F)(Cl)(Br)(I)}]^{2-} has n number of geometrical isomers. Then, the spin-only magnetic moment and crystal field stabilisation energy [CFSE] of [Fe(CN)6]n−6[\mathrm{Fe(CN)_6}]^{n-6}, respectively, are : [Note : Ignore the pairing energy]
  1. (1)0 BM and −2.4 Δ0-2.4\ \Delta_0
  2. (2)1.73 BM and −2.0 Δ0-2.0\ \Delta_0Official answer
  3. (3)2.84 BM and −1.6 Δ0-1.6\ \Delta_0
  4. (4)5.92 BM and 0

Official answer

Option 2

NTA final key (Jan 2020).

Chapter
Coordination Compounds
Topic
Coordination Isomerism
Idea tested
Square Planar MABCD Geometrical Isomers

Same topic in other shifts

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