JEE Coordination Compounds Quiz
Practice on coordination nomenclature, oxidation states, isomerism, valence bond and crystal field theory, and the magnetic and colour properties they predict.
Skill map
Levels in this jee coordination compounds quiz
Every question is generated fresh by AI and calibrated to your level - clear a level and the next one gets harder. Miss one and the AI tutor explains Coordination Compounds until it sticks, then aims a follow-up at the gap. Want to grind one level? Start the quiz and type that sub-topic as your own.
Exam focus
How Coordination Compounds is asked
One of the most dependable Inorganic chapters in JEE Main, because its question types repeat: work out an oxidation state, count isomers, or predict hybridisation and magnetic behaviour from a ligand. All three are procedural once the spectrochemical series is memorised.
Cheat sheet
Coordination Compounds formulas worth memorising
| Quantity | Formula |
|---|---|
| Spin-only magnetic moment | μ = √(n(n + 2)) BM, n = unpaired electrons |
| Effective atomic number | EAN = Z − oxidation state + 2 × coordination number |
| CFSE (octahedral) | (−0.4 x + 0.6 y)Δ₀ for t2g^x eg^y |
| Splitting comparison | Δt ≈ (4/9)Δ₀ |
Marks lost here
Common mistakes in Coordination Compounds
- Calculating the metal's oxidation state without accounting for ligand charges. Neutral ligands such as ammonia and water contribute zero, while chloride, cyanide and hydroxide each carry −1 - and getting this wrong invalidates everything after it.
- Assuming strong-field ligands always give low-spin complexes. Tetrahedral complexes are essentially always high spin because Δt is too small to force pairing, regardless of the ligand.
- Confusing coordination number with the number of ligands. A bidentate ligand like ethylenediamine occupies two sites, so three of them give a coordination number of six.
- Forgetting that the spin-only formula ignores orbital contribution. It is an approximation that works well for first-row transition metals and is what JEE expects, but it is not the full magnetic moment.
- Mixing up ionisation and linkage isomerism. Ionisation isomers exchange a ligand with the counter-ion; linkage isomers use a different donor atom of the same ambidentate ligand, such as nitrito-N versus nitrito-O.
Game rules
How a round works
- 01Spawn
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- 02Level up
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- 03Learn or lose
Every answer - right or wrong - gets an AI tutor explanation. Wrong answers respawn as follow-ups.
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Player's guide
JEE Coordination Compounds Quiz - FAQs
Why are most coordination compounds coloured?
Because crystal field splitting puts the d orbitals at slightly different energies, and the gap usually corresponds to visible light. An electron absorbs a photon to jump between them, and the colour you see is the complement of the absorbed wavelength. Complexes with d⁰ or d¹⁰ configurations have no such transition and are typically colourless.
How do I predict whether a complex is high spin or low spin?
Compare the crystal field splitting energy with the pairing energy. Strong-field ligands such as CN⁻ and CO produce a large splitting and give low spin; weak-field ligands such as halides and water give high spin. The spectrochemical series is the ordering you need to memorise.
Is the jee coordination compounds quiz free?
Yes - completely free, with no sign-up required. Type a topic, press start, and the AI generates an adaptive Coordination Compounds quiz with an explanation for every answer.
Can teachers host this jee coordination compounds quiz live for a class?
Yes - create a free teacher account, host a live room on "Coordination Compounds", and students join with a 6-character code at quff.in/join. No student accounts needed.
From the blog
Coordination Compounds guides & reading
JEE Coordination Compounds: 30 Practice Questions Solved
Thirty solved Coordination questions. The question types repeat closely, which makes this one of the most dependable Inorganic chapters.
Exam PrepJEE Chemical Bonding: 30 Practice Questions with Solutions
Thirty solved Bonding questions. Molecular orbital theory is the reliable half - bond orders for the common diatomics are a fixed, learnable set.
Exam PrepJEE Atomic Structure: 30 Practice Questions with Solutions
Thirty solved Atomic Structure questions - and the chapter overlaps directly with Modern Physics, so the work counts twice.
More exam prep quizzes
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