JEE Main Chemistry · Coordination Compounds

High and Low Spin States

High and Low Spin States (Coordination Compounds) was asked 19 times in 17 JEE Main shifts, 2020–2026, out of the 42 shifts Lumi analysed. 6 of the 19 had a numerical answer.

Times asked: 19; in 17 shifts
Years: 2020–2026
Usual format: Single correct; Application
Pattern: Asked most years; repeats across shifts

How it is asked

Unpaired electrons and absorption order of complexes
Electrons in eg of complex

Difficulty

Easy 5Medium 12Hard 2

Where it sits

Chapter: Coordination Compounds. Topic: Crystal Field Theory, 40 questions over 9 ideas.

All 19 questions

Newest first, each with its options and official answer.

4 Apr 2026, Shift 2 · Q60Consider the metal complexes $\mathrm{[Ni(en)_3]^{2+}}$ (A), $\mathrm{[NiCl_4]^{2-}}$ (B) and $\mathrm{[Ni(NH_3)_6]^{2+}}$ (C). Choose the…MediumSingle correct
5 Apr 2026, Shift 2 · Q71The total number of unpaired electrons present in the $d^3$ , $d^4$ (low spin) $d^5$ (high spin), $d^6$ (high spin) and $d^7$ (low spin)…EasyNumerical value
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
8 Apr 2026, Shift 2 · Q71Number of paramagnetic complexes among the following is ________. $[\mathrm{MnBr_4}]^{2-}$ , $[\mathrm{NiCl_4}]^{2-}$ ,…MediumNumerical value
2 Apr 2025, Shift 1 · Q60Given below are two statements : Statement (I) : In octahedral complexes, when $\Delta_o<$ P high spin complexes are formed. When…EasyTwo statements
2 Apr 2025, Shift 1 · Q74A transition metal (M) among Mn, Cr, Co and Fe has the highest standard electrode potential ( $\mathrm{M^{3+}/M^{2+}}$ ). It forms a metal…MediumNumerical value
2 Apr 2025, Shift 2 · Q61The type of hybridization and the magnetic property of $\mathrm{[MnCl_6]^{3-}}$ are,MediumSingle correct
3 Apr 2025, Shift 2 · Q62Identify the diamagnetic octahedral complex ions from below ; A. $[\mathrm{Mn(CN)_6}]^{3-}$ B. $[\mathrm{Co(NH_3)_6}]^{3+}$ C.…MediumOther
4 Apr 2025, Shift 2 · Q60The correct order of $\mathrm{[FeF_6]^{3-}}$ , $\mathrm{[CoF_6]^{3-}}$ , $\mathrm{[Ni(CO)_4]}$ and $\mathrm{[Ni(CN)_4]^{2-}}$ complex…MediumSingle correct
7 Apr 2025, Shift 1 · Q73The number of paramagnetic complexes among $[\mathrm{FeF_6}]^{3-}$ , $[\mathrm{Fe(CN)_6}]^{3-}$ , $[\mathrm{Mn(CN)_6}]^{3-}$ ,…HardNumerical value
7 Apr 2025, Shift 2 · Q62The number of unpaired electrons responsible for the paramagnetic nature of the following complex species are respectively :…MediumSingle correct
7 Apr 2025, Shift 2 · Q73The number of paramagnetic metal complex species among $\mathrm{[Co(NH_3)_6]^{3+}}$ , $\mathrm{[Co(C_2O_4)_3]^{3-}}$ ,…HardNumerical value
8 Apr 2024, Shift 1 · Q71Number of Complexes with even number of electrons in $\mathrm{t_{2g}}$ orbitals is - $[\mathrm{Fe(H_2O)_6}]^{2+}$ ,…MediumSingle correct
31 Jan 2024, Shift 2 · Q71Match List I with List II LIST I (Complex ion) | LIST II (Electronic Configuration) A. $\mathrm{[Cr(H_2O)_6]^{3+}}$ | I.…MediumMatch the list
25 Jul 2021, Shift 1 · Q39Which one of the following species responds to an external magnetic field ?EasySingle correct
18 Mar 2021, Shift 1 · Q58The total number of unpaired electrons present in the complex $\mathrm{K_3[Cr(oxalate)_3]}$ is __________.EasyNumerical value
9 Jan 2020, Shift 2 · Q37The correct order of the spin-only magnetic moments of the following complexes is : (I) $\mathrm{[Cr(H_2O)_6]Br_2}$ (II)…MediumOther
2 Sep 2020, Shift 1 · Q36For octahedral Mn(II) and tetrahedral Ni(II) complexes, consider the following statements : (I) both the complexes can be high spin. (II)…MediumOther
6 Sep 2020, Shift 2 · Q39For a $\mathrm{d^4}$ metal ion in an octahedral field, the correct electronic configuration is :EasySingle correct