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Home/JEE MAINS/chemistry/coordination compounds
Curated PYQ Collection

Top 50 Most Repeated COORDINATION COMPOUNDS PYQs | JEE MAINS

A curated collection of the most important questions from COORDINATION COMPOUNDS, fully solved with step-by-step concepts to prepare for JEE MAINS.

Question #1

Practice Question

A.[Cu(NH₃)₄]²⁺
B.[Co(NH₃)₆]³⁺
C.[ZnCl₄]²⁻
D.[Ag(NH₃)₂]⁺

Concept Applied

Werner defined coordination number as the number of donor atoms directly bonded to the central metal ion. In \([Co(NH₃)₆]^{3+}\), six ammonia ligands ...

Read Full Step-by-Step Solution →

Question #2

Practice Question

A.The complex is high-spin because \(\Delta_o < B\).
B.The complex is low-spin because \(\Delta_o \gg B\).
C.The complex shows no splitting as CN⁻ is a weak‑field ligand.
D.The complex has a tetrahedral geometry.

Concept Applied

For octahedral complexes, if \(\Delta_o\) is much larger than the Racah parameter \(B\), electrons pair in the lower‑energy t₂g set, giving a low‑spin...

Read Full Step-by-Step Solution →

Question #3

Practice Question

A.$t_{2g}$: $d_{xy}, d_{yz}, d_{zx}$
B.$e_g$: $d_{x^2-y^2}, d_{z^2}$
C.$t_{2g}$: $d_{x^2-y^2}, d_{z^2}$
D.$e_g$: $d_{xy}, d_{yz}$

Concept Applied

In an octahedral field, ligands approach along axes, destabilizing $d_{x^2-y^2}$ and $d_{z^2}$ (higher energy, $e_g$ set). The $d_{xy}, d_{yz}, d_{zx}...

Read Full Step-by-Step Solution →

Question #4

Practice Question

A.$[Co(NH_3)_6]^{3+}$
B.$[Co(en)_3]^{3+}$
C.$[Co(H_2O)_6]^{3+}$
D.$[CoCl_6]^{3-}$

Concept Applied

Ethylene diamine (en) is a bidentate ligand. The chelate effect stabilizes complexes with multidentate ligands due to entropy increase upon formation....

Read Full Step-by-Step Solution →

Question #5

Practice Question

A.Chelate effect
B.Higher charge on Fe
C.Ion-dipole interaction
D.Hydrogen bonding

Concept Applied

Chelate effect increases stability via ring formation with multidentate ligands....

Read Full Step-by-Step Solution →

Question #6

Practice Question

A.Ionization
B.Linkage
C.Geometric
D.Optical

Concept Applied

Exchange of ligand between coordination sphere and ionization sphere....

Read Full Step-by-Step Solution →

Question #7

Practice Question

A.[CoF6]3-
B.[Co(NH3)6]3+
C.[Co(H2O)6]3+
D.[CoCl6]3-

Concept Applied

NH3 is strongest field ligand listed....

Read Full Step-by-Step Solution →

Question #8

Practice Question

A.NH$_3$
B.H$_2$O
C.Cl$^-$
D.I$^-$

Concept Applied

In the spectrochemical series, ligands are ordered from weak to strong field as I$^-$ < Br$^-$ < Cl$^-$ < F$^-$ < H$_2$O < NH$_3$ < en < CN$^-$. Hence...

Read Full Step-by-Step Solution →

Question #9

Practice Question

A.[Cu(NH₃)₄]²⁺
B.[Co(NH₃)₆]³⁺
C.[ZnCl₄]²⁻
D.[Ag(NH₃)₂]⁺

Concept Applied

Werner defined coordination number as the number of donor atoms directly bonded to the central metal ion. In \([Co(NH₃)₆]^{3+}\), six ammonia ligands ...

Read Full Step-by-Step Solution →

Question #10

Practice Question

A.The complex is high-spin because \(\Delta_o < B\).
B.The complex is low-spin because \(\Delta_o \gg B\).
C.The complex shows no splitting as CN⁻ is a weak‑field ligand.
D.The complex has a tetrahedral geometry.

Concept Applied

For octahedral complexes, if \(\Delta_o\) is much larger than the Racah parameter \(B\), electrons pair in the lower‑energy t₂g set, giving a low‑spin...

Read Full Step-by-Step Solution →

Question #11

Practice Question

A.$t_{2g}$: $d_{xy}, d_{yz}, d_{zx}$
B.$e_g$: $d_{x^2-y^2}, d_{z^2}$
C.$t_{2g}$: $d_{x^2-y^2}, d_{z^2}$
D.$e_g$: $d_{xy}, d_{yz}$

Concept Applied

In an octahedral field, ligands approach along axes, destabilizing $d_{x^2-y^2}$ and $d_{z^2}$ (higher energy, $e_g$ set). The $d_{xy}, d_{yz}, d_{zx}...

Read Full Step-by-Step Solution →

Question #12

Practice Question

A.$[Co(NH_3)_6]^{3+}$
B.$[Co(en)_3]^{3+}$
C.$[Co(H_2O)_6]^{3+}$
D.$[CoCl_6]^{3-}$

Concept Applied

Ethylene diamine (en) is a bidentate ligand. The chelate effect stabilizes complexes with multidentate ligands due to entropy increase upon formation....

Read Full Step-by-Step Solution →

Question #13

Practice Question

A.Chelate effect
B.Higher charge on Fe
C.Ion-dipole interaction
D.Hydrogen bonding

Concept Applied

Chelate effect increases stability via ring formation with multidentate ligands....

Read Full Step-by-Step Solution →

Question #14

Practice Question

A.Ionization
B.Linkage
C.Geometric
D.Optical

Concept Applied

Exchange of ligand between coordination sphere and ionization sphere....

Read Full Step-by-Step Solution →

Question #15

Practice Question

A.[CoF6]3-
B.[Co(NH3)6]3+
C.[Co(H2O)6]3+
D.[CoCl6]3-

Concept Applied

NH3 is strongest field ligand listed....

Read Full Step-by-Step Solution →

Question #16

Practice Question

A.NH$_3$
B.H$_2$O
C.Cl$^-$
D.I$^-$

Concept Applied

In the spectrochemical series, ligands are ordered from weak to strong field as I$^-$ < Br$^-$ < Cl$^-$ < F$^-$ < H$_2$O < NH$_3$ < en < CN$^-$. Hence...

Read Full Step-by-Step Solution →

Question #17

Practice Question

A.[Cu(NH₃)₄]²⁺
B.[Co(NH₃)₆]³⁺
C.[ZnCl₄]²⁻
D.[Ag(NH₃)₂]⁺

Concept Applied

Werner defined coordination number as the number of donor atoms directly bonded to the central metal ion. In \([Co(NH₃)₆]^{3+}\), six ammonia ligands ...

Read Full Step-by-Step Solution →

Question #18

Practice Question

A.The complex is high-spin because \(\Delta_o < B\).
B.The complex is low-spin because \(\Delta_o \gg B\).
C.The complex shows no splitting as CN⁻ is a weak‑field ligand.
D.The complex has a tetrahedral geometry.

Concept Applied

For octahedral complexes, if \(\Delta_o\) is much larger than the Racah parameter \(B\), electrons pair in the lower‑energy t₂g set, giving a low‑spin...

Read Full Step-by-Step Solution →

Question #19

Practice Question

A.$t_{2g}$: $d_{xy}, d_{yz}, d_{zx}$
B.$e_g$: $d_{x^2-y^2}, d_{z^2}$
C.$t_{2g}$: $d_{x^2-y^2}, d_{z^2}$
D.$e_g$: $d_{xy}, d_{yz}$

Concept Applied

In an octahedral field, ligands approach along axes, destabilizing $d_{x^2-y^2}$ and $d_{z^2}$ (higher energy, $e_g$ set). The $d_{xy}, d_{yz}, d_{zx}...

Read Full Step-by-Step Solution →

Question #20

Practice Question

A.$[Co(NH_3)_6]^{3+}$
B.$[Co(en)_3]^{3+}$
C.$[Co(H_2O)_6]^{3+}$
D.$[CoCl_6]^{3-}$

Concept Applied

Ethylene diamine (en) is a bidentate ligand. The chelate effect stabilizes complexes with multidentate ligands due to entropy increase upon formation....

Read Full Step-by-Step Solution →

Question #21

Practice Question

A.Chelate effect
B.Higher charge on Fe
C.Ion-dipole interaction
D.Hydrogen bonding

Concept Applied

Chelate effect increases stability via ring formation with multidentate ligands....

Read Full Step-by-Step Solution →

Question #22

Practice Question

A.Ionization
B.Linkage
C.Geometric
D.Optical

Concept Applied

Exchange of ligand between coordination sphere and ionization sphere....

Read Full Step-by-Step Solution →

Question #23

Practice Question

A.[CoF6]3-
B.[Co(NH3)6]3+
C.[Co(H2O)6]3+
D.[CoCl6]3-

Concept Applied

NH3 is strongest field ligand listed....

Read Full Step-by-Step Solution →

Question #24

Practice Question

A.NH$_3$
B.H$_2$O
C.Cl$^-$
D.I$^-$

Concept Applied

In the spectrochemical series, ligands are ordered from weak to strong field as I$^-$ < Br$^-$ < Cl$^-$ < F$^-$ < H$_2$O < NH$_3$ < en < CN$^-$. Hence...

Read Full Step-by-Step Solution →

Question #25

Practice Question

A.[Cu(NH₃)₄]²⁺
B.[Co(NH₃)₆]³⁺
C.[ZnCl₄]²⁻
D.[Ag(NH₃)₂]⁺

Concept Applied

Werner defined coordination number as the number of donor atoms directly bonded to the central metal ion. In \([Co(NH₃)₆]^{3+}\), six ammonia ligands ...

Read Full Step-by-Step Solution →

Question #26

Practice Question

A.The complex is high-spin because \(\Delta_o < B\).
B.The complex is low-spin because \(\Delta_o \gg B\).
C.The complex shows no splitting as CN⁻ is a weak‑field ligand.
D.The complex has a tetrahedral geometry.

Concept Applied

For octahedral complexes, if \(\Delta_o\) is much larger than the Racah parameter \(B\), electrons pair in the lower‑energy t₂g set, giving a low‑spin...

Read Full Step-by-Step Solution →

Question #27

Practice Question

A.$t_{2g}$: $d_{xy}, d_{yz}, d_{zx}$
B.$e_g$: $d_{x^2-y^2}, d_{z^2}$
C.$t_{2g}$: $d_{x^2-y^2}, d_{z^2}$
D.$e_g$: $d_{xy}, d_{yz}$

Concept Applied

In an octahedral field, ligands approach along axes, destabilizing $d_{x^2-y^2}$ and $d_{z^2}$ (higher energy, $e_g$ set). The $d_{xy}, d_{yz}, d_{zx}...

Read Full Step-by-Step Solution →

Question #28

Practice Question

A.$[Co(NH_3)_6]^{3+}$
B.$[Co(en)_3]^{3+}$
C.$[Co(H_2O)_6]^{3+}$
D.$[CoCl_6]^{3-}$

Concept Applied

Ethylene diamine (en) is a bidentate ligand. The chelate effect stabilizes complexes with multidentate ligands due to entropy increase upon formation....

Read Full Step-by-Step Solution →

Question #29

Practice Question

A.Chelate effect
B.Higher charge on Fe
C.Ion-dipole interaction
D.Hydrogen bonding

Concept Applied

Chelate effect increases stability via ring formation with multidentate ligands....

Read Full Step-by-Step Solution →

Question #30

Practice Question

A.Ionization
B.Linkage
C.Geometric
D.Optical

Concept Applied

Exchange of ligand between coordination sphere and ionization sphere....

Read Full Step-by-Step Solution →

Question #31

Practice Question

A.[CoF6]3-
B.[Co(NH3)6]3+
C.[Co(H2O)6]3+
D.[CoCl6]3-

Concept Applied

NH3 is strongest field ligand listed....

Read Full Step-by-Step Solution →

Question #32

Practice Question

A.NH$_3$
B.H$_2$O
C.Cl$^-$
D.I$^-$

Concept Applied

In the spectrochemical series, ligands are ordered from weak to strong field as I$^-$ < Br$^-$ < Cl$^-$ < F$^-$ < H$_2$O < NH$_3$ < en < CN$^-$. Hence...

Read Full Step-by-Step Solution →

Question #33

Practice Question

A.[Cu(NH₃)₄]²⁺
B.[Co(NH₃)₆]³⁺
C.[ZnCl₄]²⁻
D.[Ag(NH₃)₂]⁺

Concept Applied

Werner defined coordination number as the number of donor atoms directly bonded to the central metal ion. In \([Co(NH₃)₆]^{3+}\), six ammonia ligands ...

Read Full Step-by-Step Solution →

Question #34

Practice Question

A.The complex is high-spin because \(\Delta_o < B\).
B.The complex is low-spin because \(\Delta_o \gg B\).
C.The complex shows no splitting as CN⁻ is a weak‑field ligand.
D.The complex has a tetrahedral geometry.

Concept Applied

For octahedral complexes, if \(\Delta_o\) is much larger than the Racah parameter \(B\), electrons pair in the lower‑energy t₂g set, giving a low‑spin...

Read Full Step-by-Step Solution →

Question #35

Practice Question

A.$t_{2g}$: $d_{xy}, d_{yz}, d_{zx}$
B.$e_g$: $d_{x^2-y^2}, d_{z^2}$
C.$t_{2g}$: $d_{x^2-y^2}, d_{z^2}$
D.$e_g$: $d_{xy}, d_{yz}$

Concept Applied

In an octahedral field, ligands approach along axes, destabilizing $d_{x^2-y^2}$ and $d_{z^2}$ (higher energy, $e_g$ set). The $d_{xy}, d_{yz}, d_{zx}...

Read Full Step-by-Step Solution →

Question #36

Practice Question

A.$[Co(NH_3)_6]^{3+}$
B.$[Co(en)_3]^{3+}$
C.$[Co(H_2O)_6]^{3+}$
D.$[CoCl_6]^{3-}$

Concept Applied

Ethylene diamine (en) is a bidentate ligand. The chelate effect stabilizes complexes with multidentate ligands due to entropy increase upon formation....

Read Full Step-by-Step Solution →

Question #37

Practice Question

A.Chelate effect
B.Higher charge on Fe
C.Ion-dipole interaction
D.Hydrogen bonding

Concept Applied

Chelate effect increases stability via ring formation with multidentate ligands....

Read Full Step-by-Step Solution →

Question #38

Practice Question

A.Ionization
B.Linkage
C.Geometric
D.Optical

Concept Applied

Exchange of ligand between coordination sphere and ionization sphere....

Read Full Step-by-Step Solution →

Question #39

Practice Question

A.[CoF6]3-
B.[Co(NH3)6]3+
C.[Co(H2O)6]3+
D.[CoCl6]3-

Concept Applied

NH3 is strongest field ligand listed....

Read Full Step-by-Step Solution →

Question #40

Practice Question

A.NH$_3$
B.H$_2$O
C.Cl$^-$
D.I$^-$

Concept Applied

In the spectrochemical series, ligands are ordered from weak to strong field as I$^-$ < Br$^-$ < Cl$^-$ < F$^-$ < H$_2$O < NH$_3$ < en < CN$^-$. Hence...

Read Full Step-by-Step Solution →

Question #41

Practice Question

A.[Cu(NH₃)₄]²⁺
B.[Co(NH₃)₆]³⁺
C.[ZnCl₄]²⁻
D.[Ag(NH₃)₂]⁺

Concept Applied

Werner defined coordination number as the number of donor atoms directly bonded to the central metal ion. In \([Co(NH₃)₆]^{3+}\), six ammonia ligands ...

Read Full Step-by-Step Solution →

Question #42

Practice Question

A.The complex is high-spin because \(\Delta_o < B\).
B.The complex is low-spin because \(\Delta_o \gg B\).
C.The complex shows no splitting as CN⁻ is a weak‑field ligand.
D.The complex has a tetrahedral geometry.

Concept Applied

For octahedral complexes, if \(\Delta_o\) is much larger than the Racah parameter \(B\), electrons pair in the lower‑energy t₂g set, giving a low‑spin...

Read Full Step-by-Step Solution →

Question #43

Practice Question

A.$t_{2g}$: $d_{xy}, d_{yz}, d_{zx}$
B.$e_g$: $d_{x^2-y^2}, d_{z^2}$
C.$t_{2g}$: $d_{x^2-y^2}, d_{z^2}$
D.$e_g$: $d_{xy}, d_{yz}$

Concept Applied

In an octahedral field, ligands approach along axes, destabilizing $d_{x^2-y^2}$ and $d_{z^2}$ (higher energy, $e_g$ set). The $d_{xy}, d_{yz}, d_{zx}...

Read Full Step-by-Step Solution →

Question #44

Practice Question

A.$[Co(NH_3)_6]^{3+}$
B.$[Co(en)_3]^{3+}$
C.$[Co(H_2O)_6]^{3+}$
D.$[CoCl_6]^{3-}$

Concept Applied

Ethylene diamine (en) is a bidentate ligand. The chelate effect stabilizes complexes with multidentate ligands due to entropy increase upon formation....

Read Full Step-by-Step Solution →

Question #45

Practice Question

A.Chelate effect
B.Higher charge on Fe
C.Ion-dipole interaction
D.Hydrogen bonding

Concept Applied

Chelate effect increases stability via ring formation with multidentate ligands....

Read Full Step-by-Step Solution →

Question #46

Practice Question

A.Ionization
B.Linkage
C.Geometric
D.Optical

Concept Applied

Exchange of ligand between coordination sphere and ionization sphere....

Read Full Step-by-Step Solution →

Question #47

Practice Question

A.[CoF6]3-
B.[Co(NH3)6]3+
C.[Co(H2O)6]3+
D.[CoCl6]3-

Concept Applied

NH3 is strongest field ligand listed....

Read Full Step-by-Step Solution →

Question #48

Practice Question

A.NH$_3$
B.H$_2$O
C.Cl$^-$
D.I$^-$

Concept Applied

In the spectrochemical series, ligands are ordered from weak to strong field as I$^-$ < Br$^-$ < Cl$^-$ < F$^-$ < H$_2$O < NH$_3$ < en < CN$^-$. Hence...

Read Full Step-by-Step Solution →

Question #49

Practice Question

A.[Cu(NH₃)₄]²⁺
B.[Co(NH₃)₆]³⁺
C.[ZnCl₄]²⁻
D.[Ag(NH₃)₂]⁺

Concept Applied

Werner defined coordination number as the number of donor atoms directly bonded to the central metal ion. In \([Co(NH₃)₆]^{3+}\), six ammonia ligands ...

Read Full Step-by-Step Solution →

Question #50

Practice Question

A.The complex is high-spin because \(\Delta_o < B\).
B.The complex is low-spin because \(\Delta_o \gg B\).
C.The complex shows no splitting as CN⁻ is a weak‑field ligand.
D.The complex has a tetrahedral geometry.

Concept Applied

For octahedral complexes, if \(\Delta_o\) is much larger than the Racah parameter \(B\), electrons pair in the lower‑energy t₂g set, giving a low‑spin...

Read Full Step-by-Step Solution →
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