NEET Previous Year Questions (2014-21): Coordination Compounds Notes | Study Chemistry Class 12 - NEET

Q.1. Ethylene diaminetetraacetate (EDTA) ion is :    (2021)

(a) Bidentate ligand with two "N" donor atoms
(b) Tridentate ligand with three "N" donor
(c) Hexadentate ligand with four "O" and two atoms "N'' donor atoms
(d) Unidentate ligand
Ans: C

Donar atom ( N, N, O, O, O, O)

Q.2. Which of the following is the correct order of increasing field strength of ligands to form coordination compounds?    (2020)
A:
B:
C:
D:
Ans: C
Fact from spectrochemical series.

Q.3. What is the correct electronic configuration of the central atom in K₄[Fe(CN)₆] based on crystal field theory?    (2019)
A:
B:
C:
D:
Ans: B
K₄[Fe(CN)₆]
Fe ground state: [Ar]3d⁶4s²
Fe²⁺: 3d⁶4s⁰


Q.4. The type of isomerism shown by the complex [CoCl₂(en)₂] is    (2018)
A: Geometrical isomerism
B: Coordination isomerism
C: Ionization isomerism
D: Linkage isomerism
Ans: A


Q.5. Which one of the following ions exhibits d–d transition and para magnetism as well ?    (2018)
A:
B:
C:
D: 
Ans: D


Q.6. The geometry and magnetic behaviour of the complex [Ni(CO)₄] are    (2018)
A: square planar geometry and diamagnetic
B: tetrahedral geometry and diamagnetic
C: square planar geometry and paramagnetic
D: tetrahedral geometry and paramagnetic
Ans: B


Q.7. Iron carbonyl, Fe(CO)₅ is    (2018)
A: Tetranuclear
B: Mononuclear
C: Trinuclear
D: Dinuclear
Ans: B


Q.8. An example of a sigma bonded organometallic compound is :    (2017)
A: Grignard's reagent
B: Ferrocene
C: Cobaltocene
D: Ruthenocene
Ans: A
Grignard's reagent i.e., RMgX is σ-bonded organometallic compound.

Q.9. The correct order of the stoichiometries of AgCl formed when AgNO₃ in excess is treated with the complexes : CoCl_3.6NH_3, CoCl_3.5NH₃,CoCl₃.4NH₃ respectively is :-    (2017)
A:
B:
C:
D:
Ans: B


Q.10. Correct increasing order for the wavelengths of absorption in the visible region the complexes of Co³⁺ is :-    (2017)
A:
B:
C:
D:
Ans: D


Q.11. Pick out the correct statement with respect to[Mn(CN)₆]^3–:-    (2017)
A: It is sp³d² hybridised and tetrahedral
B: It is d²sp³ hybridised and octahedral
C: It is dsp² hybridised and square planar
D: It is sp³d² hybridised and octahedral
Ans: B






Q.12. Which of the following has longest C-O bond length ? (Free C-O bond length in CO is 1.128Å)    (2016)
A: [Mn(CO)6]⁺
B: Ni(CO)₄
C: [Co(CO)₄]^-
D: [Fe(CO)₄]^2-
Ans: D
The greater the negative charge on the carbonyl complex, the more easy it would be for the metal to permit its electrons to participate in the back bonding, the higher would be the M-C bond order and simultaneously there would be larger reduction in the C-O bond order. Thus, [Fe(CO)₄]^2- has the lowest C-O bond order means the longest bond length.

Q.13. Which of these statements about [Co(CN)₆]^3- is true ?    (2015)
A: [Co(CN)₆]^3- has no unpaired electrons and will be in a high-spin configuration
B: [Co(CN)₆]^3- has no unpaired electrons and will be in a low-spin configuration
C: [Co(CN)₆]^3- has four unpaired electrons and will be in a low-spin configuration.
D: [Co(CN)₆]^3- has four unpaired electrons and will be in a high-spin configuration
Ans: B