NEET UG · Chemistry · Class 12

Coordination Compounds: NEET previous year questions

27 questions in ten years of NEET, asked in 10 of 10 years. Here is what this chapter tests and how.

Asked in 10 years: 27; 10 of 10 papers
10-year average: 2.6; a paper · 3.9 since 2024 +1.9
Typical range: 1–4; questions a paper; fewest 1, most 6
Weighted estimate: 3.4; model, recent papers count more · about 14 marks

Typical range (fact)
10-year average (fact)
Weighted estimate (model)

Typical range: questions per paper in the middle eight of the ten papers, leaving out the single highest and lowest year (about the 10th to 90th percentile), each paper scaled to 180 questions. The ten-year average and the range are historical fact. The weighted estimate is a model: each paper's share, with recent papers counting more (half-life three years), and dropped syllabus removed. It is a guide to effort, not a forecast.

What to do

How to spend time on Coordination Compounds

Priority

Must do

Among the chapters that held the first half of all NEET questions in ten years. How bands are set

Past questions: 27in 10 of 10 papers
Study plan gives it: 23 hover 12 months; 17 h over 6

Study this chapter →Practise →

Ideas asked most often

Spectrochemical Series Usage3×
IUPAC Nomenclature Rules2×
Werner's Theory: Molar Conductivity Ranking2×
Spin-Only Magnetic Moment via CFT2×
Nickel Complex Geometry Trio2×

221 of the 252 ideas in Lumi’s map of this chapter have not been asked or touched in ten years. New questions often come from ideas like these, so learn the whole chapter, not just the list above.

Questions per year

Kind of question

SHARE OF 10 YEARS

Application33%
Recall30%
Calculation11%
Two statements11%
Concept7%
Match the lists7%

Most common asks: statement i/ii on coordination compounds (2); order/ranking of property (2); identify nuclearity of metal carbonyl (1).

Profile

This chapter in numbers

Where it ranks, how steady it is, and what it costs to study.

Rank, all NEET chapters: #12; of 80 by weighted estimate
Rank in Chemistry: #2; of 21 chapters
Share of the paper: 1.5%; ten-year average
Busiest year: 2026; 6 questions
Year to year: Some swing; varies by about 1.5 questions
Long-run direction: +0.17; questions per paper, per year
Easy questions: 48%; 56% of ideas rated hard
With a figure: 0%; graph, diagram or structure
Study time: 23 h; 17 h on a 6-month plan
Marks per study hour: 0.61; #28 of 80 chapters
Foundation for others: 78%; of its ideas are used in other chapters

Difficulty, year by year

Each question rated easy, medium or hard against NCERT.

20174
20183
20191
20201
20212
20222
20232
20243
20253
20266

Easy
Medium
Hard

What it asks you to do

SHARE OF QUESTIONS

Recall37%
Application37%
Multi-step15%
Concept11%

Coverage

How much of the chapter NEET has used

We split the chapter into 252 ideas. In ten years NEET built a question around 17 of them. Most of the chapter has never been asked, which is why learning it whole beats memorising past questions.

Asked as the main idea: 17
Touched on in a question: 14
Never asked: 221

Topics

What repeats, topic by topic

Questions per topic in each year's paper. Topics that come every year are worth learning first.

Coordination Compounds · Every year13
31112212
Crystal Field Theory · Every year10
11111122
Coordination Isomerism · Most years4
112

’17’18’19’20’21’22’23’24’25’26

Topic	2017	’18	2019	’20	2021	’22	2023	’24	2025	’26	Total
Coordination CompoundsEvery year	3	1	·	·	1	1	2	2	1	2	13
Crystal Field TheoryEvery year	1	1	1	1	1	1	·	·	2	2	10
Coordination IsomerismMost years	·	1	·	·	·	·	·	1	·	2	4

03+questions in that year’s paper

Coordination Compounds
Expect a one-line factual recall item about Coordination Compounds; an application item that applies the idea to a fresh situation is the next most likely shape. Past framings centre on: statement i/ii on coordination compounds; identify nuclearity of metal carbonyl.

Drill down

Topic, idea, question

Open a topic to see every idea NEET tested inside it, then open an idea to read the questions. Each row shows its ten papers.

topicAskedShareYears’17’18’19’20’21’22’23’24’25’26

Open13 · 48%48%8/103222
10 ideas inside
- Repeated2 · 15%15%2/10
- Repeated2 · 15%15%2/10
- Repeated2 · 15%15%2/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
Open10 · 37%37%8/1022
Open4 · 15%15%3/102

Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.

Ideas

The exact ideas NEET has asked

Inside the topics, 19 different ideas were tested. These came more than once, or are new since 2024.

Spectrochemical Series Usage3×
order/ranking of ligand field strength
IUPAC Nomenclature Rules2×
iupac name of complex
Werner's Theory: Molar Conductivity RankingNew2×
identify electrolyte type of complex
Spin-Only Magnetic Moment via CFT2×
match list on magnetic moments of complexes
Nickel Complex Geometry Trio2×
geometry and magnetism of complex
Absorbed Wavelength and Splitting Energy2×
order/ranking of property
Homoleptic vs Heteroleptic Complexes2×
identify homoleptic complex
Facial and Meridional Isomerism in [MA3B3]New1×
identify complex showing an isomerism
Optical Activity in [M(AA)2B2] Cis/Trans IsomersNew1×
statement i/ii on chirality of complexes
VBT: Magnetic PropertiesNew1×
statement i/ii on coordination compounds
Structural Isomerism IdentificationNew1×
match list on complexes and isomerism type

Idea	Times	Usually asked as
Spectrochemical Series Usageorder/ranking of ligand field strength	3	One-line MCQ
IUPAC Nomenclature Rulesiupac name of complex	2	One-line MCQ
Werner's Theory: Molar Conductivity Rankingidentify electrolyte type of complex	2	One-line MCQNew
Spin-Only Magnetic Moment via CFTmatch list on magnetic moments of complexes	2	Match the lists
Nickel Complex Geometry Triogeometry and magnetism of complex	2	Other
Absorbed Wavelength and Splitting Energyorder/ranking of property	2	One-line MCQ
Homoleptic vs Heteroleptic Complexesidentify homoleptic complex	2	One-line MCQ
Facial and Meridional Isomerism in [MA3B3]identify complex showing an isomerism	1	One-line MCQNew
Optical Activity in [M(AA)2B2] Cis/Trans Isomersstatement i/ii on chirality of complexes	1	Two statementsNew
VBT: Magnetic Propertiesstatement i/ii on coordination compounds	1	Two statementsNew
Structural Isomerism Identificationmatch list on complexes and isomerism type	1	Match the listsNew

Every question

Coordination Compounds questions, year by year

The opening words of each question as it appeared in the official paper.

NEET 20266 questions

Q47Given below are two statements: Statement-I : $[\mathrm{Fe(ox)_3}]^{3-}$ is chiral. Statement-II : trans- $[\mathrm{Cr(H_2O)_2(ox)_2}]^-$ …Two statements
Q58According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength isOne-line MCQ
Q66Among the species given below, the spin-only magnetic moment is highest for (Given : Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)One-line MCQ
Q68The formula of tetraammineaquachloridocobalt(III) chloride isOne-line MCQ
Q78The complex which has facial and meridional isomers is (Given : py = pyridine and en = $\mathrm{H_2N-CH_2-CH_2-NH_2}$ )One-line MCQ
Q87A 1:3 electrolyte in an aqueous solution isOne-line MCQ

NEET 20253 questions

Q51Which of the following are paramagnetic? A. $[NiCl_4]^{2-}$ B. $Ni(CO)_4$ C. $[Ni(CN)_4]^{2-}$ D. $[Ni(H_2O)_6]^{2+}$ E. $Ni(PPh_3)_4$ …Other
Q57The correct order of the wavelength of light absorbed by the following complexes is, A. $[Co(NH_3)_6]^{3+}$ B. $[Co(CN)_6]^{3-}$ C.…One-line MCQ
Q63Out of the following complex compounds, which of the compound will be having the minimum conductance in solution?One-line MCQ

NEET 20243 questions

Q52Given below are two statements : Statement I : Both $[\mathrm{Co(NH_3)_6}]^{3+}$ and $[\mathrm{CoF_6}]^{3-}$ complexes are octahedral but…Two statements
Q82Match List I with List II. List I (Complex) | List II (Type of isomerism) A. $[\mathrm{Co(NH_3)_5(NO_2)}]\mathrm{Cl_2}$ | I. Solvate…Match the lists
Q96Given below are two statements : Statement I : $[\mathrm{Co(NH_3)_6}]^{3+}$ is a homoleptic complex whereas $[\mathrm{Co(NH_3)_4Cl_2}]^+$ …Two statements

NEET 20232 questions

Q71Homoleptic complex from the following complexes is :One-line MCQ
Q97Which complex compound is most stable?One-line MCQ

NEET 20222 questions

Q83The IUPAC name of the complex - $\mathrm{[Ag(H_2O)_2][Ag(CN)_2]}$ is :One-line MCQ
Q98The order of energy absorbed which is responsible for the color of complexes (A) $\mathrm{[Ni(H_2O)_2(en)_2]^{2+}}$ (B)…One-line MCQ

NEET 20212 questions

Q59Ethylene diaminetetraacetate (EDTA) ion is :One-line MCQ
Q94Match List - I with List - II. List - I | List - II (a) $\mathrm{[Fe(CN)_6]^{3-}}$ | (i) 5.92 BM (b) $\mathrm{[Fe(H_2O)_6]^{3+}}$ | (ii) 0…Match the lists

NEET 20201 question

Q116Which of the following is the correct order of increasing field strength of ligands to form coordination compounds ?One-line MCQ

NEET 20191 question

Q75What is the correct electronic configuration of the central atom in $K_4[Fe(CN)_6]$ based on crystal field theory ?One-line MCQ

NEET 20183 questions

Q71Iron carbonyl, $\mathrm{Fe(CO)_5}$ isOne-line MCQ
Q72The type of isomerism shown by the complex $\mathrm{[CoCl_2(en)_2]}$ isOne-line MCQ
Q73The geometry and magnetic behaviour of the complex $\mathrm{[Ni(CO)_4]}$ areOne-line MCQ

NEET 20174 questions

Q66The correct order of the stoichiometries of AgCl formed when $\mathrm{AgNO_3}$ in excess is treated with the complexes :…One-line MCQ
Q73Correct increasing order for the wavelengths of absorption in the visible region for the complexes of $\mathrm{Co^{3+}}$ is :One-line MCQ
Q75An example of a sigma bonded organometallic compound isOne-line MCQ
Q84Pick out the correct statement with respect to $\mathrm{[Mn(CN)_6]^{3-}}$ :One-line MCQ

Questions from the official NEET UG papers published by NTA (CBSE before 2019). Topic and idea tags, counts and notes are Lumi’s.

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