Coordination Compounds NEET Previous Year Questions (PYQs)
Practice NEET previous year questions from Coordination Compounds. These MCQs are selected from past NEET exams and include answers with clear explanations.
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Coordination Compounds Chapter Notes
Q1. Iron carbonyl, Fe(CO)5, is:
(NEET 2018)
- (A) Tetranuclear
- (B) Mononuclear
- (C) Dinuclear
- (D) Trinuclear
Show Answer
(B)
Show Explanation
Fe(CO)5 contains only one iron atom, hence it is a mononuclear complex.
Q2. The type of isomerism shown by the complex [CoCl2(en)2]+ is:
(NEET 2018)
- (A) Geometrical isomerism
- (B) Coordination isomerism
- (C) Linkage isomerism
- (D) Ionisation isomerism
Show Answer
(A)
Show Explanation
Octahedral complexes with different positions of ligands show cis–trans (geometrical) isomerism.
Q3. The geometry and magnetic behaviour of [Ni(CO)4] are:
(NEET 2018)
- (A) Square planar, paramagnetic
- (B) Tetrahedral, diamagnetic
- (C) Square planar, diamagnetic
- (D) Tetrahedral, paramagnetic
Show Answer
(B)
Show Explanation
CO is a strong field ligand causing pairing of electrons. The complex is tetrahedral and diamagnetic.
Q4. An example of a sigma (σ) bonded organometallic compound is:
(NEET 2017)
- (A) Grignard reagent
- (B) Ferrocene
- (C) Cobaltocene
- (D) Ruthenocene
Show Answer
(A)
Show Explanation
Grignard reagents (RMgX) contain a direct metal–carbon σ bond.
Q5. Which complex will show zero crystal field stabilisation energy (CFSE)?
(NEET 2014)
- (A) [Mn(H2O)6]3+
- (B) [Fe(H2O)6]3+
- (C) [Co(H2O)6]2+
- (D) [Co(H2O)6]3+
Show Answer
(A)
Show Explanation
Mn3+ has d4 high-spin configuration giving zero CFSE.
Q6. Which complex is used as an anticancer agent?
(NEET 2014)
- (A) mer-[Co(NH3)3Cl3]
- (B) cis-[Pt(NH3)2Cl2]
- (C) Na2[PtCl4]
- (D) [Co(NH3)6]3+
Show Answer
(B)
Show Explanation
Cisplatin (cis-[Pt(NH3)2Cl2]) is used as an anticancer drug.
Q7. The IUPAC name of [Fe(CN)6]3− is:
(NEET 2015)
- (A) Hexacyanoiron(III)
- (B) Hexacyanitoferrate(III)
- (C) Tricyanoferrate(III)
- (D) Hexacyanidoferrate(III)
Show Answer
(D)
Show Explanation
Correct IUPAC name uses “cyanido” and “ferrate” for anionic complex.
Q8. Which ligand shows the strongest field strength?
(NEET 2020)
- (A) H2O
- (B) NH3
- (C) CN−
- (D) F−
Show Answer
(C)
Show Explanation
CN− is a strong field ligand and causes maximum splitting.
Q9. Which of the following complexes is diamagnetic?
(NEET 2013)
- (A) [Fe(H2O)6]3+
- (B) [CoF6]3−
- (C) [Ni(CN)4]2−
- (D) [Mn(H2O)6]2+
Show Answer
(C)
Show Explanation
CN− causes pairing of electrons, making the complex diamagnetic.
Q10. Which type of isomerism is shown by [Co(NH3)5NO2]Cl2?
(NEET 2010)
- (A) Ionisation
- (B) Linkage
- (C) Coordination
- (D) Optical
Show Answer
(B)
Show Explanation
NO2− is an ambidentate ligand showing linkage isomerism.
Q11. Which complex will show optical isomerism?
(NEET 2004)
- (A) [Pt(NH3)2Cl2]
- (B) [Co(en)3]3+
- (C) [Ni(CO)4]
- (D) [Fe(CN)6]4−
Show Answer
(B)
Show Explanation
Octahedral complexes with three bidentate ligands show optical isomerism.
Q12. Which complex is square planar?
(NEET)
- (A) [Ni(CO)4]
- (B) [Ni(CN)4]2−
- (C) [Fe(H2O)6]2+
- (D) [CoF6]3−
Show Answer
(B)
Show Explanation
d8 complexes with strong ligands form square planar geometry.
Q13. Which of the following ligands is bidentate?
(NEET 1994)
- (A) NH3
- (B) CN−
- (C) en
- (D) Cl−
Show Answer
(C)
Show Explanation
Ethylenediamine (en) coordinates through two nitrogen atoms.
Q14. Which complex shows maximum paramagnetism?
(NEET 2011)
- (A) [Fe(CN)6]4−
- (B) [Mn(H2O)6]2+
- (C) [Co(NH3)6]3+
- (D) [Ni(CO)4]
Show Answer
(B)
Show Explanation
Mn2+ has five unpaired electrons, giving maximum paramagnetism.
Q15. Coordination number of Cr in [Cr(en)3]3+ is:
(NEET 2001)
- (A) 3
- (B) 4
- (C) 6
- (D) 8
Show Answer
(C)
Show Explanation
Each en is bidentate; 3 en ligands give coordination number 6.
Q16. Which metal carbonyl has the strongest C–O bond?
(NEET)
- (A) Ni(CO)4
- (B) [Fe(CO)4]2−
- (C) [Co(CO)4]−
- (D) [Mn(CO)6]+
Show Answer
(D)
Show Explanation
Least back bonding occurs in positively charged complexes, giving strongest C–O bond.
Q17. Which complex will not absorb visible light?
(NEET 2010)
- (A) [Cu(H2O)6]2+
- (B) [Fe(H2O)6]2+
- (C) [Zn(H2O)6]2+
- (D) [Co(H2O)6]2+
Show Answer
(C)
Show Explanation
Zn2+ has completely filled d-orbitals, so no d–d transitions.
Q18. Which statement about EDTA is correct?
(NEET 2021)
- (A) Unidentate ligand
- (B) Bidentate ligand
- (C) Tridentate ligand
- (D) Hexadentate ligand
Show Answer
(D)
Show Explanation
EDTA coordinates through six donor atoms (4 O + 2 N).
Q19. Which complex exhibits fac–mer isomerism?
(NEET)
- (A) [Co(NH3)6]3+
- (B) [Co(NH3)3Cl3]
- (C) [Ni(CO)4]
- (D) [Pt(NH3)2Cl2]
Show Answer
(B)
Show Explanation
Octahedral complexes with formula MA3B3 show fac–mer isomerism.
Q20. Which of the following statements is true?
(NEET)
- (A) All square planar complexes are paramagnetic
- (B) All tetrahedral complexes are low spin
- (C) Strong field ligands cause pairing of electrons
- (D) Weak field ligands cause pairing of electrons
Show Answer
(C)
Show Explanation
Strong field ligands increase Δo and cause pairing of electrons.
👉 More Coordination Compounds NEET PYQs will be added gradually.