Transition Metals: Properties, Coordination Complexes, and Applications

Question 1

What type of bonding is found in the coordination complex [Fe(H2O)6]3+?

Accepted Answer

Coordinate covalent

Answer

Ionic

Answer

Covalent

Answer

Metallic

Question 2

Which of the following is a common oxidation state for transition metals?

Accepted Answer

+2

Answer

+1

Answer

+5

Answer

+7

Question 3

Which of the following factors does NOT affect the stability of a coordination complex?

Accepted Answer

Pressure

Answer

Charge on the metal ion

Answer

Size of the ligand

Answer

Nature of the solvent

Question 4

What is the IUPAC name of the complex [Pt(NH3)2Cl4]2-?

Accepted Answer

Diamminetetrachloroplatinate(II) ion

Answer

Diamminetetrachloroplatinate(IV) ion

Answer

Tetraamminetetrachloroplatinate(II) ion

Answer

Tetraamminetetrachloroplatinate(IV) ion

Question 5

Which of the following is an example of a ligand that can form both sigma and pi bonds to a metal ion?

Accepted Answer

CN-

Answer

H2O

Answer

NH3

Answer

Cl-

Question 6

Identify the property that is NOT characteristic of transition metals:

Accepted Answer

High melting points

Answer

Variable oxidation states

Answer

Formation of colored compounds

Answer

Paramagnetism

Question 7

Determine the coordination number of the metal ion in the complex [Fe(CN)6]4-:

Accepted Answer

6

Answer

4

Answer

8

Answer

10

Question 8

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

Accepted Answer

CN-

Answer

H2O

Answer

NH3

Answer

Cl-

Question 9

Which of the following electronic transitions is a d-d transition?

Accepted Answer

d → d

Answer

n → π*

Answer

π → π*

Answer

s → d

Question 10

Select the reaction that demonstrates the redox properties of transition metals:

Accepted Answer

Fe + 2HCl → FeCl2 + H2

Answer

CuSO4 + NaOH → Cu(OH)2 + Na2SO4

Answer

AgNO3 + NaCl → AgCl + NaNO3

Answer

CaCO3 → CaO + CO2

Question 11

Which of the following accurately describes the roles of transition metal complexes in biological systems?

Accepted Answer

Electron transfer, oxygen transport, and catalysis

Answer

Electron transfer and oxygen transport only

Answer

Oxygen transport and catalysis only

Answer

Electron transfer only

Question 12

What geometry does the complex ion [Ni(NH3)6]2+ adopt?

Accepted Answer

Octahedral

Answer

Tetrahedral

Answer

Square planar

Answer

Trigonal bipyramidal

Question 13

What is the correct magnetochemical series for the first row transition metals?

Accepted Answer

Mn2+ < Fe2+ < Co2+ < Ni2+ < Cu2+

Answer

Mn2+ > Fe2+ < Co2+ < Ni2+ > Cu2+

Answer

Cu2+ < Ni2+ < Co2+ < Fe2+ < Mn2+

Answer

Cu2+ > Ni2+ > Co2+ > Fe2+ > Mn2+

Question 14

Which of the following properties is NOT characteristic of transition metals?

Accepted Answer

Low melting points

Answer

Variable oxidation states

Answer

Ability to form colored ions

Answer

Catalytic activity

Question 15

The coordination sphere of the complex ion [Fe(CN)6]4- is:

Accepted Answer

Octahedral

Answer

Tetrahedral

Answer

Square planar

Answer

Trigonal bipyramidal

Question 16

The oxidation state of iron in the complex ion [Fe(NH3)6]3+ is:

Accepted Answer

+3

Answer

+1

Answer

+2

Answer

+4

Question 17

Which of the following reactions is an example of a redox reaction involving a transition metal?

Accepted Answer

Fe2O3 + 3CO → 2Fe + 3CO2

Answer

CuSO4 + 2NaOH → Cu(OH)2 + Na2SO4

Answer

AgNO3 + HCl → AgCl + HNO3

Answer

BaCl2 + Na2SO4 → BaSO4 + 2NaCl

Question 18

The catalytic converter in cars primarily functions to:

Accepted Answer

Reduce the emission of carbon monoxide and nitrogen oxides

Answer

Increase the octane number of petrol

Answer

Remove particulate matter from the exhaust

Answer

Convert nitrogen oxides into nitrogen

Question 19

Which of the following elements is a transition metal?

Accepted Answer

Chromium

Answer

Sodium

Answer

Calcium

Answer

Iodine

Question 20

The systematic IUPAC name of the complex ion [Cr(en)2Cl2]+ is:

Accepted Answer

Diethylenediaminedichlorochromium(III) ion

Answer

Dichlorodiethylenediaminechromium(III) ion

Answer

Chromium(III) diethylenediaminedichloro ion

Answer

Ethylenediaminechromium(III) chloride ion

Question 21

Which spectroscopic technique can reveal details about the electronic structure of transition metal complexes?

Accepted Answer

Ultraviolet-Visible (UV-Vis) spectroscopy

Answer

X-ray diffraction

Answer

Nuclear Magnetic Resonance (NMR) spectroscopy

Answer

Infrared (IR) spectroscopy

Question 22

Which of the following statements accurately describes a key characteristic of transition metals?

Accepted Answer

They have incompletely filled d orbitals.

Answer

They form exclusively ionic bonds.

Answer

They are highly reactive and unstable.

Answer

They exhibit a single, fixed oxidation state.

Question 23

Consider the coordination complex [Fe(NH3)6]3+. What is the oxidation state of iron in this complex?

Accepted Answer

+3

Answer

+2

Answer

+6

Answer

-3

Question 24

Which of the following applications does NOT involve transition metals?

Accepted Answer

Insulators in electrical wires

Answer

Catalysts in industrial processes

Answer

Electrodes in batteries

Answer

Pigments in paints

Question 25

What is the primary factor influencing the stability of a transition metal complex?

Accepted Answer

The number of d electrons in the metal ion

Answer

The size of the metal ion

Answer

The electronegativity of the metal ion

Answer

The pH of the solution

Question 26

Which of the following is an example of a "sandwich complex"?

Accepted Answer

[Fe(CO)5]

Answer

[Co(NH3)6]Cl3

Answer

[Ni(CN)4]2-

Answer

[PtCl6]2-

Question 27

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

Accepted Answer

Inertness to chemical reactions

Answer

Variable oxidation states

Answer

High melting points

Answer

High electrical conductivity

Question 28

Which of the following ligands forms the strongest coordination complex with transition metals?

Accepted Answer

CO

Answer

NH3

Answer

H2O

Answer

Cl-

Question 29

Which of the following is the correct electronic configuration of the scandium ion, Sc3+?

Accepted Answer

[Ar]3d0

Answer

[Ar]3d1

Answer

[Ar]3d2

Answer

[Ar]3d3

Question 30

The coordination complex [Co(NH3)6]3+ has an:

Accepted Answer

Octahedral geometry

Answer

Tetrahedral geometry

Answer

Square planar geometry

Answer

Trigonal bipyramidal geometry

Question 31

The ability of transition metals to form coloured complexes is primarily due to:

Accepted Answer

d-d transitions

Answer

s-s transitions

Answer

p-p transitions

Answer

n-π* transitions

Question 32

Which of the following is a d-block element?

Accepted Answer

Iron

Answer

Sodium

Answer

Chlorine

Answer

Oxygen

Question 33

The IUPAC name for the complex [Fe(CN)6]4- is:

Accepted Answer

Hexacyanoferrate(III) ion

Answer

Hexacyanoferrate(II) ion

Answer

Hexacyanoferrate(IV) ion

Answer

Hexacyanoferrate(VI) ion

Question 34

Which of the following is a Lewis acid?

Accepted Answer

H+

Answer

NH3

Answer

OH-

Answer

Cl-

Question 35

Which element belongs to the d-block in the periodic table?

Accepted Answer

Chromium

Answer

Sodium

Answer

Magnesium

Answer

Chlorine

Question 36

Determine the oxidation state of the metal ion in potassium dichromate, K2Cr2O7.

Accepted Answer

+6

Answer

+2

Answer

+3

Answer

+4

Question 37

Determine the correct electronic configuration of the metal ion in the complex ion [Fe(CN)6]4- according to crystal field theory.

Accepted Answer

[Ar]3d6

Answer

[Ar]3d5

Answer

[Ar]3d4

Answer

[Ar]3d3

Question 38

Which of the following reactions represents a redox reaction involving a transition metal?

Accepted Answer

Fe2O3 + 3CO → 2Fe + 3CO2

Answer

2Cu + S → Cu2S

Answer

AgNO3 + NaCl → AgCl + NaNO3

Answer

CaCO3 → CaO + CO2