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NEET UG · Chemistry · Chapter 19

Coordination Compounds NEET PYQs (1994–2026)

108 questions from Coordination Compounds have appeared in NEET UG between 1994 and 2026, including 27 in the last five papers (2022–2026). The most-asked topic is Isomerism in Coordination Compounds (20 questions). Practise them all with instant answers and step-by-step solutions.

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Questions
108
Years covered
31
Topics
10
Difficulty
E 72 · M 5 · M 25 · H 6

Solved Coordination Compounds PYQs

3 recent questions with answers. The full set of 108 is free to practise.

  1. NEET 2026MediumStructure and Bonding
    Q1
    A 1:3 electrolyte in an aqueous solution is:
    • A[CoCl2(NH3)4]Cl
    • B[CoCl(NH3)5]Cl2
    • C[Co(NH3)6]Cl3
    • D[Co(NH3)3(NO2)3]
    Show answer & solution

    Correct answer: (C)

    1:3 electrolyte means it gives 1 cation and 3 anions. [Co(NH3)6]Cl3 gives [Co(NH3)6]³+ + 3Cl-. So 1:3.
  2. NEET 2026MediumIsomerism in Coordination Compounds
    Q2
    The complex which has facial and meridional isomers is:

    (Given: py = pyridine and en = H2N-CH2-CH2-NH2)
    • A[Cr(py)3(Cl)3]
    • B[Cr(H2O)6]³+
    • C[Co(NH3)4(H2O)2]³+
    • D[Ni(en)2(H2O)2]²+
    Show answer & solution

    Correct answer: (A)

    [Cr(py)3(Cl)3] is octahedral with three py and three Cl, can have fac and mer isomers. [Cr(H2O)6]³+ has no isomers. [Co(NH3)4(H2O)2]³+ can have cis-trans (geometrical) but not fac/mer. [Ni(en)2(H2O)2]²+ can have cis-trans. So option (1).
  3. NEET 2026HardNomenclature of Coordination Compounds
    Q3
    The formula of tetraammineaquachloridocobalt(III) chloride is:
    • A[Co(NH3)4Cl2]·H2O
    • B[Co(NH3)4]Cl3·H2O
    • C[Co(NH3)4(H2O)Cl]Cl
    • D[Co(NH3)4(H2O)Cl]Cl2
    Show answer & solution

    Correct answer: (D)

    Tetraammine = 4 NH3. Aqua = H2O. Chlorido = Cl. Cobalt(III) = Co³+. The complex ion has 4 NH3, 1 H2O, 1 Cl- (total -1 charge from Cl). Co³+ + (-1) = +2. So complex is [Co(NH3)4(H2O)Cl]²+. Two chloride ions needed

    outside. So [Co(NH3)4(H2O)Cl]Cl2.
Practise all 108 Coordination Compounds PYQs

Topic-wise question count

Where NEET has asked from Coordination Compounds, most frequent first.

  • Isomerism in Coordination Compounds20
  • Structure and Bonding17
  • Ligands and Denticity13
  • Nomenclature of Coordination Compounds10
  • Magnetic Properties9
  • Crystal Field Theory (CFT)9
  • Applications and Reactions9
  • Coordination Number and Oxidation State9
  • Stability of Coordination Compounds7
  • Homoleptic vs Heteroleptic Complexes2

Year-wise Coordination Compounds questions in NEET

Number of questions from this chapter in each year's paper(s).

2026
9
2025
3
2024
6
2023
5
2022
4
2021
2
2020
2
2019
3
2018
3
2017
4
2016
3
2015
5
2014
2
2013
7
2012
3
2011
6
2010
1
2009
3
2008
2
2007
2
2006
2
2005
2
2004
7
2003
2
2002
4
2001
5
2000
2
1998
3
1997
2
1995
3
1994
1

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