12 Chemistry - Coordination Compounds

12 Chemistry – Coordination Compounds

The number of attempts remaining is 3

Octahedral is CN=6. Consider the other listed options.

1 / 30

1. Which of the following coordination polyhedra requires a coordination number of 4?

1. Trigonal bipyramidal

2. Square planar

3. Square pyramidal

4. Octahedral

This involves non-superimposable mirror images.

2 / 30

2. Optical Isomerism in coordination compounds is observed when the complex:

1. Exchanges counter ions with ligands.

2. Has only unidentate ligands.

3. Forms non-superimposable mirror images.

4. Shows different linkage modes.

These ligands usually lead to increased stability.

3 / 30

3. A ligand that attaches to a central metal ion through two or more donor atoms to form a ring structure is known as a:

1. Unidentate ligand

2. Mononuclear entity

3. Chelate ligand

4. Didentate ligand

Primary valences are typically ionisable.

4 / 30

4. According to Werner’s Theory of coordination compounds, which valence is responsible for satisfying the primary valence of the central metal atom?

1. Ligands

2. Secondary valence

3. Anions

4. Coordination number

Count the points of attachment, not just the number of ligands.

5 / 30

5. In a coordination entity, the number of ligand donor atoms directly attached to the central metal atom/ion is defined as the:

1. Oxidation number

2. Primary valence

3. Coordination number

4. Effective atomic number

Diamagnetism is associated with the absence of this feature.

6 / 30

6. According to VBT, a complex is generally considered diamagnetic if:

1. It has a high oxidation number.

2. It contains no unpaired electrons.

3. It exhibits d²sp³ hybridisation.

4. It is a heteroleptic complex.

Ligands are named before the central metal.

7 / 30

7. In the systematic nomenclature of mononuclear coordination compounds, what is the convention for naming the ligands?

1. Only neutral ligands are named.

2. They are named based on their charge.

3. They are named before the central metal, in alphabetical order.

4. They are named after the central metal.

These isomers give different ions in solution.

8 / 30

8. The type of structural isomerism where the difference between isomers lies in whether a counter ion is present inside or outside the coordination sphere is called:

1. Geometrical Isomerism

2. Solvate Isomerism

3. Ionisation Isomerism

4. Linkage Isomerism

Everything inside the bracket is the non-ionisable part.

9 / 30

9. What is the primary role of the square bracket notation [M Lx]y in defining a coordination compound?

1. Separating primary and secondary valencies.

2. Defining the coordination entity.

3. Showing the ionisable part of the compound.

4. Indicating the total charge of the counter ions.

Think about what VBT fails to explain well, particularly colour and quantitative magnetism.

10 / 30

10. Which of the following is listed as a major limitation of the Valence Bond Theory (VBT)?

1. It accurately predicts the existence of d-d transitions.

2. It predicts geometrical shapes accurately.

3. It does not provide a quantitative interpretation of magnetic data.

4. It satisfactorily explains linkage isomerism.

Contrast this with homoleptic complexes.

11 / 30

11. Complexes where the central metal ion is bound to two or more different kinds of donor groups/ligands are termed:

1. Homoleptic

2. Mononuclear

3. Polydentate

4. Heteroleptic

This requires both the cation and anion to be complex ions.

12 / 30

12. The isomerism exhibited by complexes like [Co(NH3)6] [Cr(CN)6] [CoNH3)6] [CrCN6], where ligands are exchanged between cationic and anionic entities, is called ionization isomerism.

1. Ionisation Isomerism

2. Linkage Isomerism

3. Solvate Isomerism

4. Coordination Isomerism

Low spin means fewer unpaired electrons due to pairing.

13 / 30

13. According to VBT, what does the term ‘low spin’ complex refer to?

1. A complex with maximum electron pairing.

2. A complex with high magnetic moment.

3. A complex with sp³hybridisation.

4. A complex formed by weak field ligands.

Anionic ligands end in ‘-o’.

14 / 30

14. In the context of nomenclature, if a ligand is negatively charged, how is the name modified before the central metal atom is named?

1. Suffix '-ium' is added.

2. No change is made.

3. Suffix '-ate' is added.

4. Suffix '-o' is added.

d2sp3 corresponds to a coordination number of 6.

15 / 30

15. If a complex uses d²sp³ hybridisation according to VBT, what is the expected geometry of the coordination polyhedron?

1. Octahedral

2. Trigonal bipyramidal

3. Square planar

4. Tetrahedral

The arrangement of the ligands must be fixed relative to each other.

16 / 30

16. Which factor is crucial for a complex to exhibit Geometrical Isomerism?

1. The metal must be in a +2 oxidation state.

2. It must have a coordination number of 3.

3. It must be a homoleptic complex.

4. The complex must be heteroleptic and have rigid geometric arrangement.

This involves the point of attachment of an ambidentate ligand.

17 / 30

17. The type of structural isomerism that arises when the ligand itself contains different potential donor sites, such as SCN⁻ or NO₂⁻, is known as:

1. Solvate Isomerism

2. Linkage Isomerism

3. Coordination Isomerism

4. Ionisation Isomerism

It must have multiple donor sites.

18 / 30

18. What does a Polydentate Ligand signify?

1. A ligand that forms an ionic bond.

2. A ligand that binds through only one donor atom.

3. A ligand that is negatively charged.

4. A ligand that binds through multiple donor atoms.

This relates to the relative spatial positions of ligands.

19 / 30

19. Geometrical Isomerism is a type of Stereoisomerism that primarily arises in complexes due to:

1. Exchange of ligands between spheres

2. Different spatial arrangements of ligands

3. Formation of ring structures

4. Difference in solvent molecules

Consider the nature of the ligands attached.

20 / 30

20. A complex is termed Homoleptic if:

1. The central metal atom is bound to two or more different kinds of ligands.

2. The overall charge is zero.

3. The central metal atom is bound to only one kind of ligand.

4. It exhibits optical isomerism.

These ligands are responsible for the ‘chelate effect’.

21 / 30

21. Which type of ligand is specifically listed in the sources as contributing to the formation of stable ring structures?

1. Mononuclear ligands

2. Chelate ligands

3. Unidentate ligands

4. Ambidentate ligands

It is the hypothetical charge the metal would bear if all ligands were removed as neutral species or anions.

22 / 30

22. How is the Oxidation Number of the central atom defined in a coordination entity?

1. The number of ligands attached

2. The charge on the central atom after ligand removal

3. The total charge of the coordination sphere

4. The coordination number

Water is the solvent here.

23 / 30

23. The type of isomerism resulting from the difference in whether water molecules are coordinated directly to the metal ion or present as free solvent molecules in the crystal lattice is called:

1. Ionisation Isomerism

2. Solvate Isomerism

3. Geometrical Isomerism

4. Linkage Isomerism

Think of the Lewis acid/base definition relative to ligands.

24 / 30

24. The definition of the Central Atom/Ion in a coordination entity specifies that it acts as an acceptor of:

1. Neutral molecules

2. Electron pairs

3. Protons

4. Cations

This theory uses hybridisation concepts (e.g., sp3, d2sp3).

25 / 30

25. Which theory attempts to explain the bonding in coordination compounds by considering the overlap of filled ligand orbitals with vacant metal orbitals to form coordinate bonds?

1. Crystal Field Theory (CFT)

2. Valence Bond Theory (VBT)

3. Molecular Orbital Theory

4. Werner's Theory

This theory considers the ligands as point charges.

26 / 30

26. The separation of d orbitals into two sets of different energy levels when ligands approach the central metal ion is the fundamental premise of which bonding theory?

1. Crystal Field Theory (CFT)

2. Valence Bond Theory (VBT)

3. Molecular Orbital Theory

4. VSEPR Theory

CFT treats ligands as simple charged entities.

27 / 30

27. In the context of the Crystal Field Theory (CFT), what is the primary assumption regarding the interaction between the metal ion and the ligands?

1. The primary valence determines geometry.

2. The interaction is purely electrostatic.

3. Electrons are shared equally between the metal and ligand.

4. Ligands overlap their orbitals covalently with metal orbitals.

Think of ligands like NO2- or SCN-

28 / 30

28. What is the term used to describe a ligand that can bind to the central metal atom/ion through two different atoms?

1. Chelate ligand

2. Ambidentate ligand

3. Didentate ligand

4. Unidentate ligand

This includes the central atom and its attached ligands, usually enclosed in brackets.

29 / 30

29. What does the term Coordination Sphere refer to in a coordination compound?

1. The central atom/ion and the ligands attached to it.

2. The total number of atoms in the complex.

3. The counter ions outside the bracket.

4. The space occupied by the crystal lattice.

Check the list of examples provided in section 5.2 (f).

30 / 30

30. Which geometrical arrangement of ligands around the central metal ion is NOT listed as an example of a Coordination Polyhedron in the sources?

1. Octahedral

2. Square planar

3. T-shaped

4. Tetrahedral

Your score is

The average score is 0%

Exit

12 Chemistry – Coordination Compounds

Report a question

Find Best Tuition in Dwarka