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Friday, 9 October

JEE Main Chemistry · Coordination Compounds

Coordination Isomerism in JEE Main

Coordination Isomerism (Chemistry, Coordination Compounds) came 22 times in 19 of the 42 JEE Main shifts Lumi analysed, across 13 distinct ideas. 11 of them came in 2024–26; it was last asked in 2026.

Questions
22
in 19 shifts
Ideas asked
13
4 asked more than once
Numerical answer
10
45% of its questions
Pattern
Asked most years
last asked 2026
Questions each year
0241’173’202’211’224’233’244’254’26

In the shifts Lumi analysed for each year.

Difficulty and format
Easy 8Medium 11Hard 3

Format

  • Numerical value10 Q
  • Single correct8 Q
  • Other1 Q
  • Two statements1 Q
  • Diagram based1 Q
  • Assertion–reason1 Q
Ideas inside the topic
13 ideas
Where it sits

Part of Coordination Compounds, which had 80 questions in all. Coordination Isomerism accounts for 28% of them. In Lumi's JEE taxonomy it belongs to Inorganic Chemistry.

Every question

All 22 Coordination Isomerism questions

Newest first, each with its options and official answer.

  1. 2 Apr 2026, Shift 1 · Q715.335.33 g of CrCl3⋅6H2O\mathrm{CrCl_3{\cdot}6H_2O}, which is a 1:31:3 electrolyte, is dissolved in water and is passed through a cation exchanger.…HardNumerical value
  2. 2 Apr 2026, Shift 2 · Q61Which of the following complexes will show coordination isomerism? A. [Ag(NH3)2][Ag(CN)2][Ag(NH_3)_2][Ag(CN)_2] B. [Co(NH3)6][Cr(CN)6][Co(NH_3)_6][Cr(CN)_6] C.…MediumSingle correct
  3. 5 Apr 2026, Shift 2 · Q61Identify the correct statements from the following A. [Fe(C2O4)3]3−\mathrm{[Fe(C_2O_4)_3]^{3-}} is the most stable complex among…HardOther
  4. 6 Apr 2026, Shift 2 · Q71An excess of AgNO3\mathrm{AgNO_3} is added to 100 mL of a 0.05 M solution of tetraaquadichloridochromium (III) chloride. The number of moles…EasyNumerical value
  5. 3 Apr 2025, Shift 1 · Q72The number of optical isomers exhibited by the iron complex (A) obtained from the following reaction is ______.…MediumNumerical value
  6. 4 Apr 2025, Shift 2 · Q75A metal complex with a formula MCl4⋅3NH3\mathrm{MCl_4\cdot3NH_3} is involved in sp3d2\mathrm{sp^3d^2} hybridisation. It upon reaction with excess of…MediumNumerical value
  7. 7 Apr 2025, Shift 1 · Q62An octahedral complex having molecular composition Co.5NH3.Cl.SO4\mathrm{Co.5NH_3.Cl.SO_4} has two isomers A and B. The solution of A gives a white…EasySingle correct
  8. 8 Apr 2025, Shift 2 · Q59Given below are two statements: Statement I : A homoleptic octahedral complex, formed using monodentate ligands, will not show…MediumTwo statements
  9. 9 Apr 2024, Shift 1 · Q69Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The total…MediumAssertion–reason
  10. 9 Apr 2024, Shift 1 · Q88Number of ambidentate ligands among the following is ________. NO2−,SCN−,C2O42−,NH3,CN−,SO42−,H2O\mathrm{NO_2^-, SCN^-, C_2O_4^{2-}, NH_3, CN^-, SO_4^{2-}, H_2O}.EasyNumerical value
  11. 30 Jan 2024, Shift 2 · Q86Number of complexes which show optical isomerism among the following is ________. cis-[Cr(ox)2Cl2]3−cis\text{-}[\mathrm{Cr(ox)_2Cl_2}]^{3-},…MediumNumerical value
  12. 6 Apr 2023, Shift 1 · Q88Number of ambidentate ligands in a representative metal complex [ M(en)(SCN)4_4 ] is ________. [en = ethylenediamine]EasyNumerical value
  13. 11 Apr 2023, Shift 1 · Q69Which of the following complex has a possibility to exist as meridional isomer?EasySingle correct
  14. 11 Apr 2023, Shift 1 · Q70The set which does not have ambidentate ligand(s) isEasySingle correct
  15. 13 Apr 2023, Shift 2 · Q72The total number of stereoisomers for the complex [Cr(ox)2ClBr]3−[\mathrm{Cr}(ox)_2\mathrm{ClBr}]^{3-} (where oxox = oxalate) is:MediumSingle correct
  16. 28 Jul 2022, Shift 1 · Q89Total number of relatively more stable isomer(s) possible for octahedral complex [Cu(en)2(SCN)2]\mathrm{[Cu(en)_2(SCN)_2]} will be __________.HardNumerical value
  17. 25 Jul 2021, Shift 1 · Q60Three moles of AgCl get precipitated when one mole of an octahedral co-ordination compound with empirical formula…MediumNumerical value
  18. 18 Mar 2021, Shift 1 · Q40The correct structures of trans-[NiBr2(PPh3)2]\mathrm{[NiBr_2(PPh_3)_2]} and meridional-[Co(NH3)3(NO2)3]\mathrm{[Co(NH_3)_3(NO_2)_3]}, respectively, are :MediumDiagram basedHas a figure
  19. 8 Jan 2020, Shift 1 · Q37The complex that can show facfac- and mermer- isomers is :EasySingle correct
  20. 8 Jan 2020, Shift 1 · Q49The volume (in mL) of 0.125 M AgNO3\mathrm{AgNO_3} required to quantitatively precipitate chloride ions in 0.3 g of…MediumNumerical value
  21. 9 Jan 2020, Shift 2 · Q36The isomer(s) of [Co(NH3)4Cl2]\mathrm{[Co(NH_3)_4Cl_2]} that has/have a Cl-Co-Cl angle of 90∘90^\circ, is/are :EasySingle correct
  22. 2 Apr 2017 (offline) · Q50On treatment of 100 mL of 0.1 M solution of CoCl3.6H2O\mathrm{CoCl_3.6H_2O} with excess AgNO3\mathrm{AgNO_3}; 1.2×10221.2\times10^{22} ions are…MediumSingle correct