NEET Previous Year Question Frequency Analysis (2015–2025):
| Topic | Approximate Frequency | Last Appeared | Key Variant |
|---|---|---|---|
| CFT: predict diamagnetic/paramagnetic from ligand | 7–8 times | 2024 | Given formula, identify spin state and μ |
| product in specific medium | 6–7 times | 2023 | Identify colour change and gained |
| IUPAC nomenclature of complex | 5–6 times | 2024 | Name the complex from formula |
| Isomerism type identification | 5–6 times | 2023 | Geometrical, optical, linkage, ionisation |
| Configuration anomaly (Cr/Cu) | 4–5 times | 2022 | Write correct configuration |
| Lanthanoid contraction and consequence | 3–4 times | 2023 | Why Zr/Hf are similar |
| Biological coordination compounds | 3–4 times | 2024 | Match metal to compound |
| Spectrochemical series order | 3 times | 2022 | Arrange ligands weak to strong |
| Denticity and ligand classification | 3 times | 2023 | Identify EDTA as hexadentate |
| VBT inner vs outer orbital | 2–3 times | 2021 | sp^{3}$$d^{2} vs d^{2}$$sp^{3} hybridisation |
PYQ Trend: Highest yield combination question: A single MCQ often combines CFT (identify ligand from spectrochemical series) + magnetic moment calculation. Example: "Which of the following complexes is diamagnetic: [Ni(CO){4}], []^{2-}, [Ni(){4}]^{2+}, [Ni()_{6}]^{2+}?"
Answer logic: Ni in [Ni(CO)_{4}] is () → all paired → diamagnetic. CO is strong field but here Ni is regardless. []^{2-} is () with weak field → tetrahedral, high spin → 2 unpaired → paramagnetic.