Atomos Test Generator Free PYQs ExamsMy practice Log in / Sign up free

Coordination Compounds

JEE Main 2026 (Online) 23rd January Morning ShiftNumericalMedium📈 Topic in 54% papers+4
Ques. 1JEE Main 2026, 23 January (Morning Shift)

The crystal field stabilisation energy of [Co(oxalate)3]3- complex is 'n' times that of the [Cr(oxalate)3]3- complex. Here 'n' is . (Assume o P)

Answer

2

Solution

Oxalate is a bidentate ligand with charge −2, so both complexes are octahedral.

In [Co(ox)3]3-, x + 3(−2) = −3, so the metal is Co3+, 3d6. o P, the electrons pair in t2g, giving t2g6 eg0 and

CFSE = 6 (-0.4 o) = -2.4 o

In [Cr(ox)3]3- the metal is Cr3+, 3d3, i.e. t2g3 eg0, so

CFSE = 3 (-0.4 o) = -1.2 o

n = -2.4 o-1.2 o = 2

Answer: 2

Keep practising — Coordination Compounds

Ques. 2JEE Main 2026, 23 January (Evening Shift)

Identify the CORRECT set of details from the following : Choose the correct answer from the options given below :

  1. C & D Only
  2. A, C & E Only
  3. A, B, C, D & E
  4. A, B & D Only
Ques. 3JEE Main 2026, 23 January (Evening Shift)

Total number of unpaired electrons present in the central metal atoms/ions of [Ni(CO)4], [NiCl4]2-, [PtCl2(NH3)2], [Ni(CN)4]2- and [Pt(CN)4]2- is .

Ques. 4JEE Main 2026, 22 January (Morning Shift)

Consider the transition metal ions Mn3+, Cr3+, Fe3+ and Co3+ and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is

  1. Cr3+ > Mn3+ > Fe3+ > Co3+
  2. Mn3+ > Fe3+ > Co3+ > Cr3+
  3. Fe3+ > Co3+ > Mn3+ > Cr3+
  4. Cr3+ > Fe3+ > Co3+ > Mn3+
Ques. 5JEE Main 2026, 22 January (Morning Shift)

A first row transition metal (M) does not liberate H2 gas from dilute HCl. 1 mol of aqueous solution of MSO4 is treated with excess of aqueous KCN and then H2S(g) is passed through the solution. The amount of MS (metal sulphide) formed from the above reaction is mol.

  1. 1
  2. 2
  3. 0
  4. 3
Ques. 6JEE Main 2026, 22 January (Evening Shift)

[Ni(PPh3)2Cl2] is a paramagnetic complex. Identify the INCORRECT statements about this complex. Choose the correct answer from the options given below :

  1. C and D Only
  2. A, B and D Only
  3. C, D and E Only
  4. A and B Only
Ques. 7JEE Main 2026, 21 January (Morning Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Statement I is false but Statement II is true
  2. Both Statement I and Statement II are false
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
Ques. 8JEE Main 2026, 21 January (Evening Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Both Statement I and Statement II are false
  4. Statement I is false but Statement II is true
Ques. 9JEE Main 2026, 21 January (Evening Shift)

Identify the metal ions among Co2+, Ni2+, Fe2+, V3+ and Ti2+ having a spin-only magnetic moment value more than 3.0 BM. The sum of unpaired electrons present in the high spin octahedral complexes formed by those metal ions is .

Ques. 10JEE Main 2025, 8 April (Evening Shift)

Match the LIST-I with LIST-II Choose the correct answer from the options given below:

  1. A-I, B-II, C-III, D-IV
  2. A-IV, B-I, C-III, D-II
  3. A-III, B-II, C-I, D-IV
  4. A-III, B-IV, C-II, D-I
Ques. 11JEE Main 2025, 8 April (Evening Shift)

The number of species from the following that are involved in sp3d2 hybridization is : [Co(NH3)6]3+, SF6, [CrF6]3-, [CoF6]3-, [Mn(CN)6]3-, and [MnCl6]3-

  1. 4
  2. 3
  3. 5
  4. 6

All Coordination Compounds PYQs →

PDFDownload Coordination Compounds PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All JEE Main Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical Kinetics
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular Structures-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPrinciples Related to Practical Chemistry