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Coordination Compounds — NEET UG Chemistry PYQs

891 previous year questions from Coordination Compounds with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

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1

[ Ti(H ₂ O) ₆]²⁺ is a colored compound where as [ Zn(H ₂ O) ₆]²⁺ is colorless, because

MHT CET Medical 2026 Solution View → 2

What is coordination number of central metal ion in cisplatin ?

MHT CET Medical 2026 Solution View → 3

Which of the following complexes exhibits solvate isomerism?

MHT CET Medical 2026 Solution View → 4

What type of ligand the ethylenediamine is?

MHT CET Medical 2026 Solution View → 5

Which of the following isomers is used in the treatment of cancer?

MHT CET Medical 2026 Solution View → 6

Identify the geometry and magnetic behavior of the complex [ Ni ( CO )₄] .

MHT CET Medical 2026 Solution View → 7

Identify the correct match from the following for coordinate complex (column A) and respective geometry (column B) Column A Coordination complex Column B Geometry (A). [ Ni ( CN )₄

MHT CET Medical 2026 Solution View → 8

Which type of complex is Diamminedichloroplatinum(II)?

MHT CET Medical 2026 Solution View → 9

Which atoms from EDTA are used to bind to metal ions during formation of complex?

MHT CET Medical 2026 Solution View → 10

Which of following ligands is present in a metal carbonyl complex?

MHT CET Medical 2026 Solution View → 11

What is the correct IUPAC name of K ₃[ Fe(CN) ₆] ?

MHT CET Medical 2026 Solution View → 12

Which of the following is always a bidentate ligand?

MHT CET Medical 2026 Solution View → 13

Which of the following coordination compounds is not likely to show optical isomerism?

MHT CET Medical 2026 Solution View → 14

Find the hybridization and number of coordinate bonds formed in tetracyanonickelate(II) ion respectively.

MHT CET Medical 2026 Solution View → 15

What is the IUPAC name of K ₃[ Co ( C ₂ O ₄)₃] ?

MHT CET Medical 2026 Solution View → 16

What type of ligand the oxalate ion is?

MHT CET Medical 2026 Solution View → 17

Identify from the following a coordinate complex containing neutral ligand in it.

MHT CET Medical 2026 Solution View → 18

The IUPAC name of [ CoCl(NH ₃)₅] Cl ₂ is:

MHT CET Medical 2026 Solution View → 19

Which of the following coordinate complexes contains one or more neutral ligand / ligands in its coordination sphere?

MHT CET Medical 2026 Solution View → 20

Why aqueous cobalt chloride solution when treated with conc. HCl develops a deep blue colored solution?

MHT CET Medical 2026 Solution View → 21

Identify the anionic sphere complex from following.

MHT CET Medical 2026 Solution View → 22

What quantity of AgCl is precipitated when one mole of Pentaamminecarbonatocobalt(III) chloride is treated with excess AgNO ₃ (molar mass = 143.3 g mol ⁻¹ ) solution?

MHT CET Medical 2026 Solution View → 23

Identify homoleptic complex from following.

MHT CET Medical 2026 Solution View → 24

Identify the geometry of a complex compound [ CoF ₆]⁻³ .

MHT CET Medical 2026 Solution View → 25

According to crystal field theory, the correct order of ligands with respect to their decreasing order of field strength is

NEET 2026 Solution View → 26

Match List I with List II : List I (Complex/ion) List II (Shape/geometry) A. [ Pt ( Cl ₂)( NH ₃)₂] I. Octahedral B. [ Co ( NH ₃)₆] Cl ₃ II. Trigonal bipyramidal C. [ NiCl ₄]²⁻ III.

NEET 2026 Solution View → 27

The formula of tetraammineaquachloridocobalt(III) chloride is

NEET 2026 Solution View → 28

Match List I with List II : List I (Complex) List II (Type of isomerism) A. [ Pt ( NH ₃)₂ Cl ₂] I. Optical B. [ Co ( en )₃]³⁺ II. Solvate C. [ Co ( NH ₃)₅ NO ₂] Cl ₂ III. Geometric

NEET 2026 Solution View → 29

Given below are two statements: Statement-I : [ Fe(ox) ₃]³⁻ is chiral. Statement-II : trans -[ Cr(H ₂ O )₂( ox )₂]^- is chiral. (Given : ox H₂ = HOOC - COOH) In light of the above

NEET 2026 Solution View → 30

The complex which has facial and meridional isomers is (Given : py = pyridine and en = H₂ N - CH₂- CH₂- NH₂ )

NEET 2026 Solution View → 31

Among 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 )

NEET 2026 Solution View → 32

A 1:3 electrolyte in an aqueous solution is

NEET 2026 Solution View → 33

Which one of the following is an ambidentate ligand ?

NEET 2026 Solution View → 34

Which of the following are paramagnetic? A. [ NiCl ₄ ]²⁻ B. Ni ( CO )₄ C. [ Ni ( CN )₄ ]²⁻ D. [ Ni ( H ₂ O )₆ ]²⁺ E. Ni ( PPh ₃ )₄ Choose the correct answer from the options given

NEET 2025 Solution View → 35

Match List-I with List-II array |l|l|l|l| & List - I & & List - II A . & Haber process & (i) & Fe catalyst B. & Wacker oxidation & (ii) & PdCl ₂ C. & Wilkinson catalyst & (iii) & [

NEET 2025 Solution View → 36

The 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. [ Cu ( H ₂ O )₄ ]²⁺ D. [ Ti ( H ₂ O )₆ ]³⁺ Choose

NEET 2025 Solution View → 37

Out of the following complex compounds, which of the compound will be having the minimum conductance in solution?

NEET 2025 Solution View → 38

Which of the following is not an ambidentate ligand?

NEET 2024 Solution View → 39

[ Mn ₂( CO )₁₀ ] and [ Co ₂( CO )₈ ] structures have A. Metal-Metal linkage B. Terminal CO groups C. Bridging CO groups D. Metal in zero oxidation state Choose the correct answer f

NEET 2024 Solution View → 40

Match List I with List II. Choose the correct answer from the options given below:

NEET 2024 Solution View → 41

Given below are two statements : Statement I: Both [ Co ( NH ₃ )₆ ]³⁺ and [ CoF ₆ ]³⁻ complexes are octahedral but differ in their magnetic behaviour. Statement II: [ Co ( NH ₃ )₆

NEET 2024 Solution View → 42

Given below are two statements : Statement I : [ Co ( NH ₃ )₆ ]³⁺ is a homoleptic complex whereas [ Co ( NH ₃ )₄ Cl ₂ ]⁺ is a heteroleptic complex. Statement II : Complex [ Co ( NH

NEET 2024 Solution View → 43

Ethylene diaminetetraacetate ion is a/an:

NEET 2024 Solution View → 44

Which amongst the following compounds will show geometrical isomerism?

NEET 2023 Solution View → 45

Which of the following forms a set of a complex and a double salt, respectively?

NEET 2023 Solution View → 46

Type of isomerism exhibited by compounds [ Cr ( H ₂ O )₆ ] Cl ₃, [ Cr ( H ₂ O )₅ Cl ^ Cl Cl ₂ H ₂ O , [ Cr ( H ₂ O )₄ Cl ₂ ] Cl ₂ . H ₂ O . and the value of coordination number ( C

NEET 2023 Solution View → 47

Homoleptic complex from the following complexes is:

NEET 2023 Solution View → 48

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: Metallic sodium dissolves in liquid ammonia giving a deep blue so

NEET 2023 Solution View → 49

Which complex compound is most stable?

NEET 2023 Solution View → 50

Match List-I with List-II : array |l|l| array c List-I (Complexes) array & array c List-II (Types) array (a) [ CO ( NH ₃ )₅ NO ₂ ] Cl ₂ & (i) ionisation and [ Co ( NH ₃ )₅ ONO ] &

NEET 2022 Solution View → 51

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The metal carbon bond in metal carbonyls possesses both and

NEET 2022 Solution View → 52

Given below are two statements: Statement I: Cr ²⁺ is oxidising and Mn ³⁺ is reducing in nature. Statement II: Sc ³⁺ compounds are repelled by the applied magnetic field. In the li

NEET 2022 Solution View → 53

The IUPAC name of the complex - Ag H 2 O 2 Ag CN 2 is

NEET 2022 Solution View → 54

The order of energy absorbed which is responsible for the color of complexes (A) Ni H 2 O 2 ( en ) 2 2 + (B) Ni H 2 O 4 ( en ) 2 + and (C) Ni ( en ) 3 2 + is

NEET 2022 Solution View → 55

Ethylene diaminetetraacetate (EDTA) ion is:

NEET 2021 Solution View → 56

Match List - I with List - II. List-I List-II (a) Fe ( CN ) 6 3 - (i) 5 . 92   BM (b) Fe H 2 O 6 3 + (ii) 0   BM (c) [ Fe ( CN ) 6 ] 4 - (iii) 4 . 90   BM (d) Fe H 2

NEET 2021 Solution View → 57

Match the coordination number and type of hybridisation with distribution of hybrid orbitals in space based on Valence bond theory. Coordination number and type of hybridisation Di

NEET 2020 Solution View → 58

Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?

NEET 2020 Solution View → 59

Urea reacts with water to form A which will decompose to form B . B when passed through Cu 2 + aq , deep blue colour solution C is formed. What is the formula of C from the followi

NEET 2020 Solution View → 60

Correct increasing order for the wavelength of absorption in the visible region for the complexes of Co ³⁺ is

AIIMS 2019 Solution View → 61

Which of the following complex is optically inactive?

AIIMS 2019 Solution View → 62

Which one of the following complexes shows optical isomerism?

AIIMS 2019 Solution View → 63

The magnetic moment of Ni ²⁺ ion (atomic number of Ni =28 ) in BM unit is

JIPMER 2019 Solution View → 64

Which one follow 18 electron octet rule?

JIPMER 2019 Solution View → 65

How many ions obtain after dissociation of this complex [ Co ( NH ₃ )₆ ] Cl ₃ ?

JIPMER 2019 Solution View → 66

Aluminium chloride in acidified aqueous solution forms a complex ' A ', in which hybridisation state of Al is ' B '. What are ' A ' and ' B ', respectively?

NEET 2019 Solution View → 67

Which of the following species is not stable?

NEET 2019 Solution View → 68

What is the correct electronic configuration of the central atom in K 4 F e C N 6 based on crystal field theroy?

NEET 2019 Solution View → 69

The Crystal Field Stabilisation Energy (CFSE) for [ CoCl ₆ ]⁴⁻ is 18000 ~cm ⁻¹ . The CFSE for [ CoCl ₄ ]²⁻ will be

NEET 2019 Solution View → 70

Which of the following is a pair of diamagnetic complexes?

AIIMS 2018 Solution View → 71

Which of the following can be reduced easily?

AIIMS 2018 Solution View → 72

Assertion : In Zeise's salt coordination number of Pt is five. Reason : Ethene is a bidentate ligand.

AIIMS 2018 Solution View → 73

Which one of the following species is paramagnetic in nature?

JIPMER 2018 Solution View → 74

In the complex, [ Cr ( NH ₃ )₄ Cl ₂ ]⁺ , the oxidation number of Cr is

JIPMER 2018 Solution View → 75

Which one of the following ions exhibits d-d transition and paramagnetism as well?

NEET 2018 Solution View → 76

What is the type of isomerism shown by the complex CoCl 2 en 2 ?

NEET 2018 Solution View → 77

Iron carbonyl, Fe CO 5 is:

NEET 2018 Solution View → 78

What are the geometry and magnetic behaviors of the complex Ni CO 4 ?

NEET 2018 Solution View → 79

Among the following, the compound that is both paramagnetic and coloured is

AIIMS 2017 Solution View → 80

Assertion : [ Fe ( CN )₆ ]³⁻ has d^2 s p^3 type hybridisation. Reason: [ Fe ( CN )₆ ]³⁻ ion shows magnetic moment corresponding to two unpaired electrons.

AIIMS 2017 Solution View → 81

Which of the following is not expected to show paramagnetism?

JIPMER 2017 Solution View → 82

Which of the following coordination compounds would exhibit optical isomerism?

JIPMER 2017 Solution View → 83

The correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co 3 + is:

NEET 2017 Solution View → 84

Pick out the correct statement with respect to [ Mn ( CN ) 6 ] 3 - .

NEET 2017 Solution View → 85

The correct order of the stoichiometries of AgCl formed when AgNO 3 is treated in excess with the complexes: CoCl 3 . 6 NH 3 ,   CoCl 3 . 5 NH 3 ,   CoCl 3 . 4 NH 3 , res

NEET 2017 Solution View → 86

An example of a sigma bonded organometallic compound is

NEET 2017 Solution View → 87

Assertion : Co [ Hg ( SCN )₆ ] and Hg [ Co ( SCN )₆ ] are isomers. Reason : SCN ⁻ is a stronger ligand as compared to NCS ⁻ .

AIIMS 2016 Solution View → 88

Select the correct statement.

AIIMS 2016 Solution View → 89

In [ CO ( H ₂ O )₆ ]²⁺ , there are three unpaired electrons present. The _ calculated is 3.87 BM which is quite different from the _ experimental of 4.40 BM . This is because of

JIPMER 2016 Solution View → 90

[ CuCl ₄ ]²⁻ exists while [ Cul ₄ ]²⁻ does not exist, because

JIPMER 2016 Solution View → 91

Which of the following statements is incorrect regarding the reaction? aligned & CH ₃ CHO + [ Ag ( NH ₃ )₂ ]^ + OH & CH ₃ COO ⁻+ Ag & aligned

JIPMER 2016 Solution View → 92

Magnetic moment of [ Ti ( H ₂ O )₆ ]⁴⁺ , [ Mn ( H ₂ O )₆ ]²⁺ and [ Cr ( H ₂ O )₆ ]³⁺ can be represented as X, Y and Z . They are in order of

JIPMER 2016 Solution View → 93

The correct increasing order of trans-effect of the following species is

NEET 2016 Solution View → 94

Jahn-Teller effect is not observed in high spin complexes of

NEET 2016 Solution View → 95

Which of the following has the longest C − O bond length? (Free C − O bond length in CO is 1 . 128   A o ).

NEET 2016 Solution View → 96

Amongst the following, the most stable complex is

AIIMS 2015 Solution View → 97

Assertion: NF ₃ is a weaker ligand than N ( CH ₃ )₃ . Reason : NF ₃ ionizes to give F ⁻ ions in aqueous solution.

AIIMS 2015 Solution View → 98

The diamagnetic species is

AIIMS 2015 Solution View → 99

In acidic medium, dichromatic ion oxidises ferrous ion to 'ferric ion. If the gram molecular weight of potassium dichromate is 294 g, its gram equivalent weight (in grams) is

JIPMER 2015 Solution View → 100

0.001 mole of [ Co ( NH ₃ )₅ ( NO ₃ ) ( SO ₄ ) ] was passed through a cation exchanger and the acid coming out of it required 20 mL of 0.1 M NaOH for neutralisation. Thus, the comp

JIPMER 2015 Solution View → 101

In the complexes [ Fe ( H ₂ O )₆ ]³⁺, [ Fe ( CN )₆ ]³⁻ , [ Fe ( C ₂ O ₄ )₃ ]³⁻ and [ FeCl ₆ ]³⁻ , more stability is shown by

JIPMER 2015 Solution View → 102

When H ₂ O ₂ is added to ice cold solution of acidified potassium dichromate in ether and the contents are shaken and allowed to stand

JIPMER 2015 Solution View → 103

The sum of coordination number and oxidation number of metal M in the complex M e n 2 C 2 O 4 C l (Where en is ethylenediamine) is:

NEET 2015 Solution View → 104

The name of complex ion, F e C N 6 3 - is :

NEET 2015 Solution View → 105

The hybridization involved in complex N i C N 4 2 - is: (Atomic number of Ni = 28)

NEET 2015 Solution View → 106

Complex C o e n 2 C l 2 C l has ........ number of possible isomers. (en = ethylenediamine)

NEET 2015 Solution View → 107

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25 o C ?

NEET 2015 Solution View → 108

Which of these statements about C o C N 6 3 - is true?

NEET 2015 Solution View → 109

Least coordination number is shown by

AIIMS 2014 Solution View → 110

Assertion: Linkage isomerism arises in coordination compounds containing ambidentate ligand. Reason: Ambidentate ligand has two different donor atoms.

AIIMS 2014 Solution View → 111

Acidified K ₂ Cr ₂ O ₇ solution turns green when Na ₂ SO ₃ is added to it. This is due to the formation of

JIPMER 2014 Solution View → 112

The complexes [ Co ( NH ₃ )₆ ] [ Cr ( CN )₆ ] and [ Cr ( NH ₃ )₆ ] [ Co ( CN )₆ ] are the examples of which type of isomerism?

JIPMER 2014 Solution View → 113

Among the following complexes the one which shows Zero crystal field stabilizations energy (CFSE)

NEET 2014 Solution View → 114

Which of the following complexes is used as an anticancer agent?

NEET 2014 Solution View → 115

Assertion : EDTA forms complex with divalent metals of 3 d -series in the ratio of 1: 1 Reason : EDTA has 4- COOH groups.

AIIMS 2013 Solution View → 116

Assertion : Aq. solution of CoCl ₂ is pink in colour. It turns blue in presence of conc. HCl . Reason : It is due to the formation of [ CoCl ₄ ]²⁻ .

AIIMS 2013 Solution View → 117

Assertion : In a mixture of Cd ( II ) and Cu ( II ) , Cd ²⁺ gets precipitated in presence of KCN by H ₂ ~S . Reason : The stability constant of [ Cu ( CN )₄ ]³⁻ is greater than [ C

AIIMS 2013 Solution View → 118

A chelating agent has two or more than two donor atoms to bind a single metal ion. Which of the following is not a chelating agent?

JIPMER 2013 Solution View → 119

Crystal field spliting energy for high spin d^4 octahedral complex is:

NEET 2013 Solution View → 120

The correct IUPAC name for [ CrF ₂(e n)₂ ] Cl is:

NEET 2013 Solution View →
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