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Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.
(A) Metal-ligand bond is significantly ionic.
(B) Complexes rarely show isomerism.
(C) The coordination number is not more than 8.
(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.
(A) Metal-ligand bond is significantly ionic.
(B) Complexes rarely show isomerism.
(C) The coordination number is not more than 8.
(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.
- a)A, B and D only
- b)A, B and C only
- c)B and C only
- d)A and D only
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Among the following statements, identify the correct ones for complexe...
- (A) Metal-ligand bond is significantly ionic - This statement is correct.
- Lanthanide elements have a large ionic radius and preferentially form ionic compounds. In a lanthanide complex, the metal-ligand bond indeed has a substantial ionic character. The main reason is that the 4f orbitals, which are filled across the lanthanide series, do not extend past the outer 5s and 5p electrons. So they do not contribute much to bonding, and the bonds have more ionic character. Additionally, the 4f electrons are not readily available for sharing with ligands, encouraging ionic bond formation.
- (B) Complexes rarely show isomerism is correct for lanthanide(III) ion complexes
- This is primarily due to the structure and characteristics of the lanthanide ions. Lanthanide ions usually form octahedral complexes due to their coordination number of 6 or sometimes 9. The absence of low-lying vacant d-orbitals limits their ability to form pi bonds with ligands, resulting in a lack of geometrical or cis-trans isomerism often seen in transition metal complexes. Also, the size and charge of the lanthanide ions favor symmetry in their complexes, which further reduces the possibility of isomerism.
- (C) The coordination number is not more than 8" is incorrect for the complexes of lanthanide(III) ions.
- Lanthanides mostly have a coordination number of 6 or 9 due to their large ion size. In fact, many lanthanides can accommodate up to 12 ions in their coordination sphere under certain circumstances. Examples of such complexes include those where the lanthanide ion is surrounded by nine water molecules in an aqueous solution, or when complexed with EDTA, the coordination number is typically 10.
- (D)The magnetic moments are not accounted even approximately by spin-only value for the majority of lanthanides" is correct.
- The magnetic moments of Lanthanides are not accounted for by spin-only values because of the following reasons: -
- In Lanthanides, the f-orbitals are shielded from the ligands, and the electrons in f-orbitals interact weakly with the ligand field. Due to this weak interaction, the spin-orbit coupling is small, and the magnetic moments are not explained by the spin-only values. -
- In Lanthanides, the electrons in f-orbitals have a strong correlation with each other, and they behave like a single entity. This correlation effect is not considered in spin-only values, and hence the magnetic moment is not accounted for by spin-only values. -
- The Lanthanides have complex electronic configurations, and they exhibit multiple oxidation states. Due to this complexity, the magnetic properties of Lanthanides are not straightforward, and they cannot be explained by simple spin-only values.
So, the correct statements are A, B and D only
Most Upvoted Answer
Among the following statements, identify the correct ones for complexe...
The correct answer is option 'A'.
Explanation:
Metal-ligand bond is significantly ionic:
- The lanthanide(III) ion has a +3 oxidation state, meaning it has three electrons in its outermost shell.
- These electrons are easily donated to ligands, resulting in the formation of stable ionic bonds between the lanthanide ion and the ligands.
- The lanthanide(III) ion has a high positive charge density, which attracts the negatively charged ligands.
- Therefore, the metal-ligand bond in complexes of lanthanide(III) ions is significantly ionic.
Complexes rarely show isomerism:
- Isomerism refers to the existence of different structural arrangements of atoms within a molecule.
- In lanthanide complexes, isomerism is rare because the large size and high charge of the lanthanide ion limit the number of possible structural arrangements.
- The coordination number is typically 8, which means that the lanthanide ion is surrounded by 8 ligands.
- This limits the possible arrangements of ligands around the central lanthanide ion, resulting in a lower likelihood of isomerism.
The coordination number is not more than 8:
- The coordination number refers to the number of ligands that are directly bonded to the central metal ion.
- In complexes of lanthanide(III) ions, the coordination number is typically not more than 8.
- This is due to the large size and high charge of the lanthanide ion, which limits the number of ligands that can be accommodated around the central metal ion.
- Therefore, option C is incorrect.
The magnetic moments are not accounted even approximately by spin only value for a majority of lanthanides:
- The magnetic moment is a measure of the magnetic properties of a substance.
- In lanthanide complexes, the magnetic moments are not accurately predicted by the spin-only value for a majority of lanthanides.
- This is because lanthanide ions have partially filled 4f subshells, which have complex electronic configurations and exhibit strong electron-electron interactions.
- These interactions result in deviations from the spin-only value and the presence of magnetic anisotropy.
- Therefore, option D is correct.
Summary:
- Among the given statements, options A, B, and D are correct for complexes of lanthanide(III) ions.
- The metal-ligand bond is significantly ionic, complexes rarely show isomerism, and the magnetic moments are not accounted even approximately by the spin-only value for a majority of lanthanides.
Explanation:
Metal-ligand bond is significantly ionic:
- The lanthanide(III) ion has a +3 oxidation state, meaning it has three electrons in its outermost shell.
- These electrons are easily donated to ligands, resulting in the formation of stable ionic bonds between the lanthanide ion and the ligands.
- The lanthanide(III) ion has a high positive charge density, which attracts the negatively charged ligands.
- Therefore, the metal-ligand bond in complexes of lanthanide(III) ions is significantly ionic.
Complexes rarely show isomerism:
- Isomerism refers to the existence of different structural arrangements of atoms within a molecule.
- In lanthanide complexes, isomerism is rare because the large size and high charge of the lanthanide ion limit the number of possible structural arrangements.
- The coordination number is typically 8, which means that the lanthanide ion is surrounded by 8 ligands.
- This limits the possible arrangements of ligands around the central lanthanide ion, resulting in a lower likelihood of isomerism.
The coordination number is not more than 8:
- The coordination number refers to the number of ligands that are directly bonded to the central metal ion.
- In complexes of lanthanide(III) ions, the coordination number is typically not more than 8.
- This is due to the large size and high charge of the lanthanide ion, which limits the number of ligands that can be accommodated around the central metal ion.
- Therefore, option C is incorrect.
The magnetic moments are not accounted even approximately by spin only value for a majority of lanthanides:
- The magnetic moment is a measure of the magnetic properties of a substance.
- In lanthanide complexes, the magnetic moments are not accurately predicted by the spin-only value for a majority of lanthanides.
- This is because lanthanide ions have partially filled 4f subshells, which have complex electronic configurations and exhibit strong electron-electron interactions.
- These interactions result in deviations from the spin-only value and the presence of magnetic anisotropy.
- Therefore, option D is correct.
Summary:
- Among the given statements, options A, B, and D are correct for complexes of lanthanide(III) ions.
- The metal-ligand bond is significantly ionic, complexes rarely show isomerism, and the magnetic moments are not accounted even approximately by the spin-only value for a majority of lanthanides.
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Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer?
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Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer? for UGC NET 2025 is part of UGC NET preparation. The Question and answers have been prepared according to the UGC NET exam syllabus. Information about Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for UGC NET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer?.
Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer? for UGC NET 2025 is part of UGC NET preparation. The Question and answers have been prepared according to the UGC NET exam syllabus. Information about Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for UGC NET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer?.
Solutions for Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for UGC NET.
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Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer?, a detailed solution for Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer? has been provided alongside types of Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Among the following statements, identify the correct ones for complexes of lanthanide(III) ion.(A) Metal-ligand bond is significantly ionic.(B) Complexes rarely show isomerism.(C) The coordination number is not more than 8.(D) The magnetic moments are not accounted even approximately by spin only value for majority of lanthanides.a)A, B and D onlyb)A, B and C onlyc)B and C onlyd)A and D onlyCorrect answer is option 'A'. Can you explain this answer? tests, examples and also practice UGC NET tests.
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