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Saturday, 31 October

JEE Main 2020 · ChemistryMultiple choiceDiagram basedMediumData or graph

JEE Main 2 September 2020, Shift 2, Chemistry Q37

Question 37 of 75 in this shift, Chemistry question 12 of 25.

Simplified absorption spectra of three complexes ((i), (ii) and (iii)) of Mn+\mathrm{M^{n+}} ion are provided below; their λmax⁡\lambda_{\max} values are marked as A, B and C respectively. The correct match between the complexes and their λmax⁡\lambda_{\max} values is : (i) [M(NCS)6](−6+n)[\mathrm{M(NCS)_6}]^{(-6+n)} (ii) [MF6](−6+n)[\mathrm{MF_6}]^{(-6+n)} (iii) [M(NH3)6]n+[\mathrm{M(NH_3)_6}]^{n+}

The figure, in words

Graph: vertical axis (arrow up) labelled 'Absorption', horizontal axis (arrow right) labelled 'Wavelength (nm)'. Three separate bell-shaped absorption peaks left to right, labelled A, B and C above their tops; each peak has a vertical dashed line down to the x-axis, where the label 'lambda max' is printed under each. Peak B is drawn lowest, peak C highest, peak A in between.
  1. (1)A-(i), B-(ii), C-(iii)
  2. (2)A-(ii), B-(i), C-(iii)
  3. (3)A-(ii), B-(iii), C-(i)
  4. (4)A-(iii), B-(i), C-(ii)Official answer

Official answer

Option 4

NTA final key (Sep 2020).

Chapter
Coordination Compounds
Topic
Crystal Field Theory
Idea tested
Spectrochemical Series

Same idea in other shifts

Asked 6× in all
  1. 2 Apr 2026, Shift 1 · Q62Match List - I with List - II. List - I : Chromium (III) Complexes (en = ethylene diamine) List - II : Δ0\Delta_0 (cm−1\mathrm{cm^{-1}}) A.…MediumMatch the list
  2. 4 Apr 2024, Shift 1 · Q70The correct sequence of ligands in the order of decreasing field strength is :MediumSingle correct
  3. 5 Apr 2024, Shift 1 · Q70The correct order of ligands arranged in increasing field strength.EasySingle correct
  4. 6 Apr 2024, Shift 1 · Q71Consider the following complexes [CoCl(NH3)5]2+\mathrm{[CoCl(NH_3)_5]^{2+}}, [Co(CN)6]3−\mathrm{[Co(CN)_6]^{3-}}, [Co(NH3)5(H2O)]3+\mathrm{[Co(NH_3)_5(H_2O)]^{3+}},…MediumSingle correct
  5. 25 Jul 2022, Shift 2 · Q71The correct order of energy of absorption for the following metal complexes is A : [Ni(en)3]2+\mathrm{[Ni(en)_3]^{2+}}, B :…MediumSingle correct

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. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.