Chemistry MCQs

Coordination Compounds MCQs with Answers

Coordination compounds are formed by the coordination of a central metal ion with:
a) Other metal ions
b) Non-metal ions
c) Ligands
d) Solvent molecules
Answer: c) Ligands

The central metal ion in a coordination compound is typically surrounded by:
a) Ligands only
b) Solvent molecules only
c) Ligands and solvent molecules
d) Other metal ions
Answer: a) Ligands only

The coordination number of a metal ion in a complex is determined by:
a) The number of ligands attached to the metal ion
b) The charge on the metal ion
c) The size of the metal ion
d) The oxidation state of the metal ion
Answer: a) The number of ligands attached to the metal ion

Which of the following ligands is classified as a monodentate ligand?
a) Ethylenediamine
b) EDTA
c) Cyanide
d) Bidentate ligand
Answer: c) Cyanide

The coordination number of a metal ion in a complex can range from:
a) 1 to 3
b) 2 to 6
c) 4 to 8
d) 6 to 10
Answer: b) 2 to 6

In a complex, the ligands are attached to the central metal ion through:
a) Covalent bonds
b) Ionic bonds
c) Hydrogen bonds
d) Coordinate covalent bonds
Answer: d) Coordinate covalent bonds

The coordination sphere in a coordination compound consists of:
a) The central metal ion and the ligands directly attached to it
b) Only the ligands
c) The solvent molecules
d) Both the central metal ion and the ligands
Answer: a) The central metal ion and the ligands directly attached to it

A coordination compound with a positive charge is called a:
a) Complex ion
b) Ligand
c) Coordination sphere
d) Coordination number
Answer: a) Complex ion

The oxidation state of the central metal ion in a coordination compound is indicated by:
a) A Roman numeral in parentheses
b) A subscript
c) A prefix
d) A Greek letter
Answer: a) A Roman numeral in parentheses

Which of the following ligands is classified as a polydentate ligand?
a) Ammonia
b) Cyanide
c) EDTA
d) Chloride
Answer: c) EDTA

Which of the following coordination compounds is named correctly?
a) [Cu(H2O)6]SO4 – Copper sulfate hexahydrate
b) [Fe(CN)6]Cl3 – Ferric hexacyanide chloride
c) [Ag(NH3)2]Cl – Silver(II) diammine chloride
d) [Co(NH3)6]3+ – Hexaammine cobalt(III) ion
Answer: d) [Co(NH3)6]3+ – Hexaammine cobalt(III) ion

The ligand name “ethylenediamine” indicates that the ligand contains:
a) One nitrogen atom
b) Two nitrogen atoms
c) One oxygen atom
d) Two oxygen atoms
Answer: b) Two nitrogen atoms

Which of the following ligands is classified as an anionic ligand?
a) Ammonia
b) Water
c) Cyanide
d) Carbon monoxide
Answer: c) Cyanide

The ligand name “tetrafluoroborate” indicates that the ligand contains:
a) One fluorine atom
b) Two fluorine atoms
c) Three fluorine atoms
d) Four fluorine atoms
Answer: d) Four fluorine atoms

The coordination compound [Co(NH3)6]Cl3 has a coordination number of:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6

In the complex [PtCl2(en)2], the coordination number of the platinum ion is:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4

Which of the following ligands is classified as a chelating ligand?
a) Ammonia
b) Ethylenediamine
c) Chloride
d) Carbon monoxide
Answer: b) Ethylenediamine

The ligand name “oxalate” indicates that the ligand contains:
a) One oxygen atom
b) Two oxygen atoms
c) One carbon atom
d) Two carbon atoms
Answer: d) Two carbon atoms

Which of the following ligands is classified as a neutral ligand?
a) Ammonia
b) Hydroxide
c) Chloride
d) Cyanide
Answer: a) Ammonia

The coordination compound [Fe(CN)6]4- has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6

Which of the following ligands is classified as a monodentate ligand?
a) EDTA
b) Ethylenediamine
c) Cyanide
d) Chloride
Answer: d) Chloride

The ligand name “carbon monoxide” indicates that the ligand contains:
a) One carbon atom
b) Two carbon atoms
c) One oxygen atom
d) Two oxygen atoms
Answer: a) One carbon atom

Which of the following coordination compounds is named correctly?
a) [Co(NH3)4Cl2]Cl – Tetrachlorodiamminecobalt(II) chloride
b) [Fe(CN)6]3- – Ferrous hexacyanide
c) [Cu(NH3)2]SO4 – Diamminesulfatocopper(II)
d) [Ni(en)3]Br2 – Tris(ethylenediamine)nickel(II) bromide
Answer: d) [Ni(en)3]Br2 – Tris(ethylenediamine)nickel(II) bromide

The ligand name “ammonium” indicates that the ligand contains:
a) One nitrogen atom
b) Two nitrogen atoms
c) One oxygen atom
d) Two oxygen atoms
Answer: a) One nitrogen atom

Which of the following ligands is classified as a bidentate ligand?
a) Ammonia
b) Cyanide
c) Ethylenediamine
d) Chloride
Answer: c) Ethylenediamine

The coordination compound [Pt(NH3)4]Cl2 has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4

Which of the following ligands is classified as a bridging ligand?
a) Ammonia
b) Water
c) Cyanide
d) Carbon monoxide
Answer: c) Cyanide

The ligand name “diammine” indicates that the ligand contains:
a) One nitrogen atom
b) Two nitrogen atoms
c) One oxygen atom
d) Two oxygen atoms
Answer: b) Two nitrogen atoms

Which of the following coordination compounds is named correctly?
a) [Cu(NH3)4(H2O)2]SO4 – Tetraammineaquadisulfatocopper(II)
b) [Fe(CN)6]4- – Ferrous hexacyanide
c) [Co(NH3)3Cl3] – Triamminetrichlorocobalt(III)
d) [Ni(en)2Cl2] – Bis(ethylenediamine)dichloronickel(II)
Answer: d) [Ni(en)2Cl2] – Bis(ethylenediamine)dichloronickel(II)

The ligand name “hexacyanoferrate” indicates that the ligand contains:
a) One cyanide group
b) Two cyanide groups
c) Three cyanide groups
d) Six cyanide groups
Answer: d) Six cyanide groups

The coordination compound [Cr(H2O)6]Cl3 has a coordination number of:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6

Which of the following ligands is classified as a chiral ligand?
a) Ammonia
b) Ethylenediamine
c) Chloride
d) Carbon monoxide
Answer: b) Ethylenediamine

The ligand name “thiocyanate” indicates that the ligand contains:
a) One nitrogen atom
b) Two nitrogen atoms
c) One sulfur atom
d) Two sulfur atoms
Answer: c) One sulfur atom

Which of the following coordination compounds is named correctly?
a) [Cu(NH3)2(H2O)2]SO4 – Diamminedihydrodisulfatocopper(II)
b) [Fe(CN)6]2- – Ferric hexacyanide
c) [Co(NH3)4Cl(NO2)]NO3 – Tetraamminechloronitritocobalt(III) nitrate
d) [Ni(en)3]Cl2 – Tris(ethylenediamine)nickel(II) chloride
Answer: d) [Ni(en)3]Cl2 – Tris(ethylenediamine)nickel(II) chloride

The coordination compound [PtCl4]2- has a coordination number of:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4

In a complex, the ligands are named before the:
a) Central metal ion
b) Solvent molecules
c) Other ligands
d) Subscripts
Answer: a) Central metal ion

The ligand name “bis(ethylenediamine)” indicates that the ligand contains:
a) One ethylenediamine group
b) Two ethylenediamine groups
c) Three ethylenediamine groups
d) Four ethylenediamine groups
Answer: a) One ethylenediamine group

Which of the following ligands is classified as a neutral bidentate ligand?
a) Ethylenediamine
b) Cyanide
c) Chloride
d) Carbon monoxide
Answer: a) Ethylenediamine

The coordination compound [Fe(CN)6]3- has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: d) 6

The ligand name “oxalate” indicates that the ligand contains:
a) One oxygen atom
b) Two oxygen atoms
c) One carbon atom
d) Two carbon atoms
Answer: d) Two carbon atoms

Which of the following coordination compounds is named correctly?
a) [Co(NH3)4(OH)2]Cl2 – Tetraamminehydroxodichlorocobalt(III)
b) [Fe(CN)6]3- – Ferrous hexacyanide
c) [Cu(NH3)2]SO4 – Diamminesulfatocopper(II)
d) [Ni(en)3]Br2 – Tris(ethylenediamine)nickel(II) bromide
Answer: a) [Co(NH3)4(OH)2]Cl2 – Tetraamminehydroxodichlorocobalt(III)

The ligand name “tetraammine” indicates that the ligand contains:
a) One ammonia group
b) Two ammonia groups
c) Three ammonia groups
d) Four ammonia groups
Answer: d) Four ammonia groups

Which of the following ligands is classified as a polydentate ligand?
a) Ammonia
b) Cyanide
c) EDTA
d) Chloride
Answer: c) EDTA

The coordination compound [CoCl2(en)2]Cl has a coordination number of:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4

Which of the following ligands is classified as an anionic ligand?
a) Ammonia
b) Water
c) Cyanide
d) Carbon monoxide
Answer: c) Cyanide

The ligand name “triethylenetetramine” indicates that the ligand contains:
a) Three nitrogen atoms
b) Four nitrogen atoms
c) Five nitrogen atoms
d) Six nitrogen atoms
Answer: b) Four nitrogen atoms

Which of the following coordination compounds is named correctly?
a) Cu(NH3)3(H2O)2 – Triamminetriaquacopper(II) nitrate
b) [Fe(CN)6]2- – Ferric hexacyanide
c) [Co(NH3)4Cl(NO2)]NO3 – Tetraamminechloronitritocobalt(III) nitrate
d) [Ni(en)2Cl2] – Bis(ethylenediamine)dichloronickel(II)
Answer: a) Cu(NH3)3(H2O)2 – Triamminetriaquacopper(II) nitrate

The coordination compound [Cu(NH3)4]SO4 has a coordination number of:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4

Which of the following ligands is classified as a chelating ligand?
a) Ammonia
b) Ethylenediamine
c) Chloride
d) Carbon monoxide
Answer: b) Ethylenediamine

The ligand name “bis(ethylenediamine)” indicates that the ligand contains:
a) One ethylenediamine group
b) Two ethylenediamine groups
c) Three ethylenediamine groups
d) Four ethylenediamine groups
Answer: a) One ethylenediamine group

Which of the following coordination compounds is named correctly?
a) Cu(NH3)3(H2O)2 – Triamminetriaquacopper(II) nitrate
b) [Fe(CN)6]2- – Ferrous hexacyanide
c) [Co(NH3)4Cl(NO2)]NO3 – Tetraamminechloronitritocobalt(III) nitrate
d) [Ni(en)2Cl2] – Bis(ethylenediamine)dichloronickel(II)
Answer: a) Cu(NH3)3(H2O)2 – Triamminetriaquacopper(II) nitrate

The coordination compound [PtCl4]2- has a coordination number of:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4

In a complex, the ligands are named before the:
a) Central metal ion
b) Solvent molecules
c) Other ligands
d) Subscripts
Answer: a) Central metal ion

The ligand name “diammine” indicates that the ligand contains:
a) One nitrogen atom
b) Two nitrogen atoms
c) One oxygen atom
d) Two oxygen atoms
Answer: b) Two nitrogen atoms

Which of the following ligands is classified as a bridging ligand?
a) Ammonia
b) Water
c) Cyanide
d) Carbon monoxide
Answer: c) Cyanide

The coordination compound [Pt(NH3)4]Cl2 has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4

Which of the following ligands is classified as a chiral ligand?
a) Ammonia
b) Ethylenediamine
c) Chloride
d) Carbon monoxide
Answer: b) Ethylenediamine

The ligand name “thiocyanate” indicates that the ligand contains:
a) One nitrogen atom
b) Two nitrogen atoms
c) One sulfur atom
d) Two sulfur atoms
Answer: c) One sulfur atom

Which of the following coordination compounds is named correctly?
a) Cu(NH3)3(H2O)2 – Triamminetriaquacopper(II) nitrate
b) [Fe(CN)6]2- – Ferrous hexacyanide
c) [Co(NH3)4Cl(NO2)]NO3 – Tetraamminechloronitritocobalt(III) nitrate
d) [Ni(en)2Cl2] – Bis(ethylenediamine)dichloronickel(II)
Answer: a) Cu(NH3)3(H2O)2 – Triamminetriaquacopper(II) nitrate

The coordination compound [CoCl2(NH3)4]Cl2 has a coordination number of:
a) 2
b) 4
c) 5
d) 6
Answer: b) 4

Which of the following ligands is classified as a neutral bidentate ligand?
a) Ethylenediamine
b) Cyanide
c) Chloride
d) Carbon monoxide
Answer: a) Ethylenediamine

The ligand name “bis(ethylenediamine)” indicates that the ligand contains:
a) One ethylenediamine group
b) Two ethylenediamine groups
c) Three ethylenediamine groups
d) Four ethylenediamine groups
Answer: a) One ethylenediamine group

Which of the following coordination compounds is named correctly?
a) [Cu(NH3)4(H2O)2]SO4 – Tetraammineaquadisulfatocopper(II)
b) [Fe(CN)6]2- – Ferric hexacyanide
c) [Co(NH3)3Cl3] – Triamminetrichlorocobalt(III)
d) [Ni(en)2Cl2] – Bis(ethylenediamine)dichloronickel(II)
Answer: d) [Ni(en)2Cl2] – Bis(ethylenediamine)dichloronickel(II)

The coordination compound [Cr(NH3)6]Cl3 has a coordination number of:
a) 3
b) 4
c) 5
d) 6
Answer: d) 6

Which of the following ligands is classified as a monodentate ligand?
a) EDTA
b) Ethylenediamine
c) Cyanide
d) Chloride
Answer: d) Chloride

The ligand name “carbon monoxide” indicates that the ligand contains:
a) One carbon atom
b) Two carbon atoms
c) One oxygen atom
d) Two oxygen atoms
Answer: b) Two carbon atoms

Which of the following coordination compounds is named correctly?
a) [Cu(NH3)4Cl2]Cl – Tetrachlorodiamminecobalt(II) chloride
b) [Fe(CN)6]3- – Ferrous hexacyanide
c) [Ag(NH3)2]Cl – Silver(II) diammine chloride
d) [Co(NH3)6]3+ – Hexaammine cobalt(III) ion
Answer: d) [Co(NH3)6]3+ – Hexaammine cobalt(III) ion

The ligand name “pentammine” indicates that the ligand contains:
a) One ammonia group
b) Two ammonia groups
c) Three ammonia groups
d) Five ammonia groups
Answer: c) Three ammonia groups

Which of the following ligands is classified as a bridging ligand?
a) Ammonia
b) Water
c) Cyanide
d) Carbon monoxide
Answer: c) Cyanide

The coordination compound [Pt(NH3)2Cl2] has a coordination number of:
a) 2
b) 3
c) 4
d) 6
Answer: c) 4

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