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Friday, 9 October

JEE Main 2020 · ChemistryMultiple choiceOtherMediumConceptual

JEE Main 2 September 2020, Shift 1, Chemistry Q36

Question 36 of 75 in this shift, Chemistry question 11 of 25.

For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements : (I) both the complexes can be high spin. (II) Ni(II) complex can very rarely be low spin. (III) with strong field ligands, Mn(II) complexes can be low spin. (IV) aqueous solution of Mn(II) ions is yellow in color. The correct statements are :
  1. (1)(I), (III) and (IV) only
  2. (2)(I), (II) and (III) onlyOfficial answer
  3. (3)(II), (III) and (IV) only
  4. (4)(I) and (II) only

Official answer

Option 2

NTA final key (Sep 2020).

Chapter
Coordination Compounds
Topic
Crystal Field Theory
Idea tested
High and Low Spin States

Same idea in other shifts

Asked 19× in all
  1. 4 Apr 2026, Shift 2 · Q60Consider the metal complexes [Ni(en)3]2+\mathrm{[Ni(en)_3]^{2+}} (A), [NiCl4]2−\mathrm{[NiCl_4]^{2-}} (B) and [Ni(NH3)6]2+\mathrm{[Ni(NH_3)_6]^{2+}} (C). Choose the…MediumSingle correct
  2. 5 Apr 2026, Shift 2 · Q71The total number of unpaired electrons present in the d3d^3, d4d^4 (low spin) d5d^5 (high spin), d6d^6 (high spin) and d7d^7 (low spin)…EasyNumerical value
  3. 6 Apr 2026, Shift 2 · Q61Which of the following sequences of hybridisation, geometry and magnetic nature are correct for the given coordination compounds ? A.…MediumOther
  4. 8 Apr 2026, Shift 2 · Q71Number of paramagnetic complexes among the following is ________. [MnBr4]2−[\mathrm{MnBr_4}]^{2-}, [NiCl4]2−[\mathrm{NiCl_4}]^{2-},…MediumNumerical value
  5. 2 Apr 2025, Shift 1 · Q60Given below are two statements : Statement (I) : In octahedral complexes, when Δo<\Delta_o< P high spin complexes are formed. When…EasyTwo statements
  6. 2 Apr 2025, Shift 1 · Q74A transition metal (M) among Mn, Cr, Co and Fe has the highest standard electrode potential (M3+/M2+\mathrm{M^{3+}/M^{2+}}). It forms a metal…MediumNumerical value
  7. 2 Apr 2025, Shift 2 · Q61The type of hybridization and the magnetic property of [MnCl6]3−\mathrm{[MnCl_6]^{3-}} are,MediumSingle correct
  8. 3 Apr 2025, Shift 2 · Q62Identify the diamagnetic octahedral complex ions from below ; A. [Mn(CN)6]3−[\mathrm{Mn(CN)_6}]^{3-} B. [Co(NH3)6]3+[\mathrm{Co(NH_3)_6}]^{3+} C.…MediumOther

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.