NEET UG 2025: Coordination compounds, also known as complex compounds, are essential in understanding the behavior of metals in biological systems and industrial applications. The 25 MCQs challenge students with topics ranging from oxidation states and ligand types to isomerism and hybridization in coordination complexes.
Quiz on Coordination Compounds
1.
Question: Which of the following is a correct example of a bidentate ligand?
a) Cl⁻
b) NH₃
c) C₂O₄²⁻
d) H₂O
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Question: The central metal ion in [Cr(H₂O)₆]³⁺ is in the ___ oxidation state.
a) +3
b) +2
c) +1
d) +6
3.
Question: Which of the following is a characteristic of a cis-isomer of a square planar coordination complex?
a) Two identical ligands are adjacent
b) Two identical ligands are opposite
c) All ligands are different
d) The ligands form a tetrahedral geometry
4.
Question: Which of the following compounds is a chelate?
a) [Cu(NH₃)₄]²⁺
b) [Ni(CO)₄]
c) [Fe(C₂O₄)₃]³⁻
d) [ZnCl₄]²⁻
5.
Question: Which of the following is not a ligand?
a) H₂O
b) NH₃
c) CH₄
d) C₂O₄²⁻
6.
Question: In the complex ion [Ni(CO)₄], the ligand is:
a) Bidentate
b) Unidentate
c) Chelating
d) Bridging
7.
Question: The coordination number of the central metal ion in the complex [CrCl₃(H₂O)₃] is:
a) 3
b) 6
c) 4
d) 2
8.
Question: Which of the following ligands is not a donor atom?
a) H₂O
b) NH₃
c) Cl⁻
d) CO₂
9.
Question: Which of the following complexes exhibits ionic bonding?
a) [Cu(NH₃)₄]²⁺
b) [NiCl₄]²⁻
c) [Fe(CO)₄]
d) [PtCl₆]²⁻
10.
Question: The geometry of the complex [Ni(CO)₄] is:
a) Tetrahedral
b) Square planar
c) Octahedral
d) Linear
11.
Question: Which of the following complexes exhibits cis-trans isomerism?
a) [NiCl₄]²⁻
b) [Co(NH₃)₆]³⁺
c) [PtCl₂(NH₃)₂]
d) [Cu(NH₃)₄]²⁺
12.
Question: Which metal ion exhibits sp³ hybridization in a tetrahedral coordination complex?
a) Cu²⁺
b) Fe²⁺
c) Ni²⁺
d) Zn²⁺
13.
Question: The metal ion in the complex [Fe(CO)₅] is in the oxidation state of:
a) +3
b) +2
c) 0
d) +1
14.
Question: Which of the following statements is true for the complex [Ni(CO)₄]?
a) The central ion is in a +2 oxidation state
b) The ligand is a π-acceptor
c) The geometry is square planar
d) The complex has an oxidation state of +3
15.
Question: In the Cr₂O₇²⁻ ion, chromium is in the ___ oxidation state.
a) +6
b) +3
c) +5
d) +2
16.
Question: Which of the following complexes is paramagnetic?
a) [Co(NH₃)₆]³⁺
b) [Cu(NH₃)₄]²⁺
c) [Ni(CO)₄]
d) [Fe(CO)₄]
17.
Question: Which of the following is a monodentate ligand?
a) NH₃
b) H₂O
c) C₂O₄²⁻
d) Both a and b
18.
Question: The oxidation state of the metal in the complex [CrCl₃(H₂O)₃] is:
a) +3
b) +6
c) +2
d) +1
19.
Question: Which of the following complexes shows linkage isomerism?
a) [Co(NH₃)₆]²⁺
b) [Ni(CO)₄]
c) [Fe(CO)₄]
d) [Co(NO₂)₆]³⁻
20.
Question: The complex [Co(NH₃)₆]³⁺ has:
a) Octahedral geometry
b) Tetrahedral geometry
c) Square planar geometry
d) Linear geometry
21.
Question: In which of the following does the metal ion exhibit d²sp³ hybridization?
a) [Co(NH₃)₆]³⁺
b) [Ni(CO)₄]
c) [Fe(CO)₆]²⁻
d) [CuCl₄]²⁻
22.
Question: Which of the following is an example of a tetrahedral complex?
a) [CuCl₄]²⁻
b) [Co(NH₃)₆]³⁺
c) [Fe(CO)₆]²⁻
d) [Ni(CO)₄]
23.
Question: The number of coordination bonds in the complex [Ni(CO)₄] is:
a) 2
b) 4
c) 6
d) 8
24.
Question: The oxidation state of the metal in the complex [CuCl₄]²⁻ is:
a) +2
b) +3
c) +1
d) 0
25.
Question: Which of the following ions forms a square planar complex?
a) Cu²⁺
b) Ni²⁺
c) Pt²⁺
d) Fe²⁺
Answer Key:
1. c 2. a 3. a 4. c 5. c 6. b 7. a 8. c 9. b 10. a 11. a 12. b 13. c 14. b 15. a 16. b 17. d 18. a 19. d 20. a 21. a 22. a 23. b 24. a 25. c
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