Transition Metals and Coordination Chemistry Quizzes - Test Your Knowledge

Question 1

In coordination complexes, which type of isomerism involves the exchange of ligands between two complex ions?

Accepted Answer

Coordination isomerism

Answer

Chain isomerism

Answer

Ionization isomerism

Answer

Solvate isomerism

Question 2

Determine the correct IUPAC name of the following coordination complex: [Co(NH3)4Cl2]+

Accepted Answer

Tetraamminedichlorocobalt(II) ion

Answer

Tetraamminedichlorocobalt(III) ion

Answer

Dichlorodiamminecobalt(II) ion

Answer

Diamminetetrachlorocobalt(II) ion

Question 3

Which property is a defining characteristic of transition metals?

Accepted Answer

Excellent electrical conductivity

Answer

Stable +2 oxidation state

Answer

Completely filled d-orbitals

Answer

Absence of magnetic properties

Question 4

What is the oxidation number of chromium in the complex ion [Cr(NH3)6]3+?

Accepted Answer

+3

Answer

0

Answer

+6

Answer

-3

Question 5

Which characteristic is NOT typically associated with transition metals?

Accepted Answer

Inertness and low reactivity

Answer

Ability to form multiple oxidation states

Answer

Formation of colored compounds

Answer

High melting and boiling points

Question 6

Which of the following is NOT a direct factor influencing the stability of a coordination complex?

Accepted Answer

Temperature of the solution

Answer

Charge of the metal ion

Answer

Size of the metal ion

Answer

Number of d electrons in the metal ion

Question 7

Which factor does NOT directly affect the color of a coordination complex?

Accepted Answer

Concentration of the complex

Answer

Nature of the ligands

Answer

Geometry of the complex

Answer

Oxidation state of the metal ion

Question 8

Which type of isomerism is NOT commonly found in coordination complexes?

Accepted Answer

Ionization isomerism

Answer

Structural isomerism

Answer

Stereoisomerism

Answer

Ligand isomerism

Question 9

What is the characteristic electronic configuration of transition metals?

Accepted Answer

Partially filled d-orbitals

Answer

Fully occupied d-orbitals

Answer

Empty d-orbitals

Answer

Completely filled f-orbitals

Question 10

Which factor does NOT significantly affect the stability of coordination complexes?

Accepted Answer

Pressure

Answer

Charge of the metal ion

Answer

Size of the metal ion

Answer

Nature of the ligands

Question 11

Which of the following does NOT influence the stability of a coordination complex?

Accepted Answer

Temperature of the solution

Answer

Charge of the metal ion

Answer

Size of the metal ion

Answer

Electronegativity of the ligands

Question 12

Which property is characteristic of transition metals?

Accepted Answer

Variable oxidation states

Answer

Inertness toward oxidation

Answer

Low melting points

Question 13

Determine the oxidation state of chromium in the complex ion [Cr(NH3)4Cl2]+ using the oxidation number approach. Explain your reasoning.

Accepted Answer

+3

Answer

+1

Answer

+2

Question 14

In the coordination complex [Fe(CN)6]4-, which type of bonding is present?

Accepted Answer

Both sigma and pi bonds

Answer

Exclusively sigma bonds

Answer

Exclusively pi bonds

Answer

Neither sigma nor pi bonds

Question 15

In Valence Bond Theory, how do metal ions and ligands bond in coordination complexes?

Accepted Answer

Ligands donate electrons to metal ion, forming dative bonds

Answer

Metal ion donates electrons to ligands, forming coordinate bonds

Answer

Metal ion and ligands share electrons, forming covalent bonds

Answer

Charged metal ion and ligands attract electrostatically, forming ionic bonds

Question 16

How does the Jahn-Teller effect impact the geometry and characteristics of coordination complexes?

Accepted Answer

It distorts the complex's geometry, altering bond lengths and angles.

Answer

It solely affects the complex's color, not its geometry.

Answer

It enhances the complex's stability by forming extra bonds.

Answer

It has no influence on the complex's geometry or properties.

Question 17

In medicine, cisplatin is a coordination complex used as an anti-cancer drug. How does this coordination complex contribute to treating cancer?

Accepted Answer

Cisplatin binds to DNA, forming cross-links that prevent cell division and trigger apoptosis in cancer cells.

Answer

Cisplatin acts as a catalyst, promoting the breakdown of cancerous tumors and reducing their growth and spread.

Answer

Cisplatin releases toxic ions that specifically target and kill cancer cells without harming healthy cells.

Answer

Cisplatin boosts the immune system's ability to recognize and destroy cancer cells.

Question 18

Which type of isomerism results from different spatial arrangements of ligands around the central metal ion?

Accepted Answer

Stereoisomerism

Answer

Structural isomerism

Answer

Ionization isomerism

Answer

Solvate isomerism

Question 19

The chemical bonding in coordination complexes involves:

Accepted Answer

Both ionic and covalent bonds

Answer

Ionic bonds exclusively

Answer

Covalent bonds exclusively

Answer

Hydrogen bonds exclusively

Question 20

Which of the following is correctly identified as a strong-field ligand?

Accepted Answer

CN-

Answer

H2O

Answer

NH3

Answer

Cl-

Question 21

The electronic configuration of the metal ion in [Fe(CN)6]4- is:

Accepted Answer

[Ar]3d6

Answer

[Ar]3d7

Answer

[Ar]3d8

Answer

[Ar]3d9

Question 22

Determine the coordination number of the metal ion in the complex [Fe(NH3)6]3+.

Accepted Answer

6

Answer

2

Answer

4

Answer

8

Question 23

Identify the strong-field ligand among the following options:

Accepted Answer

CN-

Answer

Cl-

Answer

NH3

Answer

H2O

Question 24

Predict the geometry of the complex ion [Co(en)2Cl2]+.

Accepted Answer

Square planar

Answer

Tetrahedral

Answer

Octahedral

Answer

Trigonal planar

Question 25

Which of the following statements accurately describes coordination complexes?

Accepted Answer

They can exhibit both paramagnetism and diamagnetism.

Answer

They are exclusively ionic compounds.

Answer

They are always colored.

Answer

They are universally soluble in water.

Question 26

Determine the hybridization of the metal ion in the complex ion [PtCl4]2-.

Accepted Answer

sp3d2

Answer

sp

Answer

sp2

Answer

sp3

Question 27

The coordination number of the central iron ion in [Fe(CN)6]⁴⁻ is:

Accepted Answer

6

Answer

4

Answer

8

Answer

12

Question 28

Which of the following is a strong field ligand?

Accepted Answer

CN⁻

Answer

H2O

Answer

NH3

Answer

Cl⁻

Question 29

The geometry of the complex ion [Co(NH3)6]³⁺ is:

Accepted Answer

Octahedral

Answer

Tetrahedral

Answer

Square planar

Answer

Trigonal bipyramidal

Question 30

Which of the following reactions is an example of redox chemistry involving transition metals?

Accepted Answer

Fe2O3 + 3CO → 2Fe + 3CO2

Answer

AgNO3 + NaCl → AgCl + NaNO3

Answer

CH4 + 2O2 → CO2 + 2H2O

Answer

2HI → H2 + I2

Question 31

The catalytic converter in a car utilizes a transition metal to achieve which of the following functions?

Accepted Answer

Reduce harmful emissions

Answer

Increase fuel efficiency

Answer

Improve engine performance

Answer

Generate electricity

Question 32

Which of the following transitions is classified as a d-d transition?

Accepted Answer

d → d

Answer

n → π*

Answer

π → π*

Answer

σ → σ*

Question 33

Provide the IUPAC name for the complex [Cr(NH3)5Cl]Cl2:

Accepted Answer

Pentaamminechloridochromium(II) chloride

Answer

Chloridopentaamminechromium(II) chloride

Answer

Chlorochromium(II) pentaammine chloride

Answer

Hexaamminechromium(II) chloride

Question 34

To determine the precise 3D structure of a coordination complex, which technique is most reliable?

Accepted Answer

X-ray Crystallography

Answer

Infrared (IR) Spectroscopy

Answer

Nuclear Magnetic Resonance (NMR) Spectroscopy

Question 35

Coordination complexes are often used as catalysts due to their ability to undergo redox reactions. Which of the following is an example of this application?

Accepted Answer

Catalytic converters

Answer

Photographic film development

Answer

Anticancer drugs

Question 36

What type of bonding is present in the coordination complex [Fe(H2O)6]2+?

Accepted Answer

Coordinate covalent bonding

Answer

Ionic bonding

Answer

Covalent bonding

Answer

Metallic bonding

Question 37

What is the coordination number of the metal ion in [Co(en)3]3+?

Accepted Answer

6

Answer

2

Answer

4

Answer

8

Question 38

Which of the following ligands is a strong field ligand?

Accepted Answer

CN-

Answer

Cl-

Answer

NH3

Answer

H2O

Question 39

Which property is NOT characteristic of transition metals?

Accepted Answer

Noble gas configuration

Answer

High melting points

Answer

Variable oxidation states

Answer

Form colored solutions

Question 40

The complex ion [Fe(CN)6]4- has a coordination sphere with a geometry described as:

Accepted Answer

Octahedral

Answer

Tetrahedral

Answer

Square planar

Answer

Trigonal pyramidal

Question 41

The geometry of the complex ion [Co(NH3)6]3+ is best described as:

Accepted Answer

Octahedral

Answer

Tetrahedral

Answer

Square planar

Answer

Trigonal bipyramidal

Question 42

The systematic name for the complex [Pt(NH3)2Cl4] is:

Accepted Answer

Dichlorobis(ammine)platinum(II)

Answer

Diamminetetrachloroplatinum(II)

Answer

Tetraamminetetrachloroplatinum(IV)

Answer

Dichlorobis(ammine)platinum(IV)

Question 43

Which ligand is a strong field ligand, according to the spectrochemical series?

Accepted Answer

CN-

Answer

H2O

Answer

NH3

Answer

Cl-

Question 44

For an octahedral complex with a strong field ligand, how does the crystal field splitting energy (Δ) compare to the pairing energy (P)?

Accepted Answer

Δ is larger than P.

Answer

Δ is smaller than P.

Answer

Δ is equal to P.

Answer

The relationship cannot be determined from the given information.

Question 45

What does the coordination sphere of a coordination complex refer to?

Accepted Answer

The ligands directly bonded to the central metal ion.

Answer

The ions surrounding the complex in solution.

Answer

The total number of ligands surrounding the metal center.

Answer

The region around the metal ion that determines its oxidation state.

Question 46

How do the d-electrons in a metal ion influence the shape of a coordination complex?

Accepted Answer

They determine the number of ligands that can attach to the metal ion, which affects the complex's shape.

Answer

They have no impact on the shape.

Answer

They influence the strength of the bonds between the metal and ligands.

Answer

They have no effect on the complex's electronic structure.

Question 47

In Crystal Field Theory, which factor does not affect the geometry of coordination complexes?

Accepted Answer

Temperature

Answer

Number and type of ligands

Answer

Size and charge of the metal ion

Answer

Presence of other ligands or molecules in the coordination sphere

Question 48

Coordination chemistry is crucial in the design and development of coordination polymers and metal-organic frameworks (MOFs). Explain how coordination chemistry principles guide this process.

Accepted Answer

Coordination chemistry allows precise control over the metal's coordination sphere, affecting the properties and functions of the resulting materials.

Answer

Coordination bonds in MOFs and coordination polymers are not exclusively covalent.

Answer

MOFs and coordination polymers can exist in both crystalline and non-crystalline structures.

Answer

MOFs and coordination polymers have applications beyond academic research, including gas storage and catalysis.

Question 49

In homogeneous catalysis, what factors influence the selectivity and catalytic activity of coordination complexes?

Accepted Answer

Nature of the metal ion and its oxidation state

Accepted Answer

Type and electronic properties of the ligands

Accepted Answer

Reaction conditions (temperature, solvent)

Answer

Spectator ions in the reaction mixture

Question 50

Which spectroscopic technique provides information about the vibrational modes of a coordination complex?

Accepted Answer

Infrared (IR) spectroscopy

Answer

UV-Vis spectroscopy

Answer

Nuclear Magnetic Resonance (NMR) spectroscopy

Answer

Mass spectrometry

Question 51

Which of the following is NOT a characteristic property of transition metals?

Accepted Answer

High electronegativity

Answer

Ability to form colored ions

Answer

Variable oxidation states

Answer

Catalytic activity

Question 52

Which of the following ligands is a strong-field ligand?

Accepted Answer

CN-

Answer

NH3

Answer

H2O

Answer

Cl-

Question 53

The metal ion in the complex ion [Fe(CN)₆]^4- has a coordination number of:

Accepted Answer

6

Answer

10

Answer

8

Answer

4

Question 54

The IUPAC name of the complex ion [PtCl₄]^2- is:

Accepted Answer

tetrachloridoplatinate(II) ion

Answer

chloridoplatinate(IV) ion

Answer

tetrachloro platinum(II) ion

Answer

platinum(II) tetrachloride ion

Question 55

The coordination complex [Fe(CN)6]4- has a geometry described as:

Accepted Answer

Octahedral

Answer

Tetrahedral

Answer

Square planar

Answer

Trigonal bipyramidal

Question 56

Which of the following ligands is considered a strong-field ligand?

Accepted Answer

CN-

Answer

H2O

Answer

Cl-

Answer

NH3

Question 57

Which of the following reactions is an example of ligand exchange?

Accepted Answer

[Fe(H2O)6]3+ + 6CN- → [Fe(CN)6]4- + 6H2O

Answer

[Fe(H2O)6]3+ + 2OH- → [Fe(OH)2]2+ + 4H2O

Answer

[Fe(H2O)6]3+ + 3OH- → [Fe(OH)3] + 3H2O

Answer

[Fe(H2O)6]3+ + Cl- → [Fe(H2O)5Cl]2+ + H2O

Question 58

The catalytic activity of transition metals is primarily attributed to:

Accepted Answer

Their variable oxidation states and ability to form coordination complexes

Answer

High melting points

Answer

Formation of colored compounds

Question 59

Which of the following applications of coordination compounds involves their ability to absorb light?

Accepted Answer

Photochromic sunglasses

Answer

Magnetic resonance imaging contrast agents

Answer

Anticancer drugs

Answer

Catalysts in industrial processes

Question 60

What is the coordination sphere of the complex ion [Co(NH3)6]3+?

Accepted Answer

[Co(NH3)6]

Answer

Co3+

Answer

[NH3]6

Answer

[Co(NH3)6]3+

Question 61

What is the IUPAC name for the complex ion [PtCl4]2-?

Accepted Answer

Tetrachloroplatinate(II) ion

Answer

Platinum(II) chloride

Answer

Chloroplatinate(II) ion

Answer

Platinum tetrachloride

Question 62

What is the geometry of the complex ion [Fe(H2O)6]3+?

Accepted Answer

Octahedral

Answer

Trigonal bipyramidal

Answer

Square planar

Answer

Tetrahedral

Question 63

What is the coordination number of the iron ion in the complex ion [Fe(CN)₆]⁴⁻?

Accepted Answer

6

Answer

4

Answer

10

Answer

8

Question 64

Which of the following ligands is considered a strong-field ligand?

Accepted Answer

Cyanide ion (CN⁻)

Answer

Chloride ion (Cl⁻)

Answer

Water (H₂O)

Answer

Ammonia (NH₃)