Chemistry Exam > Chemistry Questions > Ce3+ and Yb3+ are colourless but show strong ...
Start Learning for Free
Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:
- a)d-f transition
- b)f to d transition
- c)Allowed f-f transition
- d)d-d transition.
Correct answer is option 'B'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Ce3+ and Yb3+ are colourless but show strong absorption in UV region. ...
Ans.
View all questions of this test
The answer to why a compound or an ion has color is related to the electronic
transitions. For example, in many organic molecules, the transitions between the highest occupied orbital (HOMO) and the lowest unoccupied orbital (LUMO) are of sufficiently low energy to be in the visible spectrum, whereas transitions between the other orbitals require more energy, and are in the UV range, so these transitions do not absorb visible light and therefore compounds are colorless.
Most Upvoted Answer
Ce3+ and Yb3+ are colourless but show strong absorption in UV region. ...
Explanation:
UV-Visible spectroscopy is a useful technique to study the electronic transitions in molecules. Ce3+ and Yb3+ are colorless because they do not show any visible color due to the absence of d-d transitions (in case of transition metals) or p-d transitions (in case of lanthanides) in their spectra. However, they show strong absorption in the UV region due to f-f transitions.
In Ce3+ and Yb3+, the electronic configuration of the outermost shell is 4f1 and 4f13, respectively. The f-orbitals of these elements are well-shielded by the 5s and 5p orbitals and do not participate in bonding. As a result, the f-electrons are largely localized and do not interact strongly with the ligands. This leads to weak crystal field splitting and no d-d or p-d transitions are observed.
On the other hand, f-f transitions are allowed in Ce3+ and Yb3+ because the f-orbitals have a large radial extent and can interact with the electric field of light. The energy required for f-f transitions falls in the UV region, hence the strong absorption in this region.
Conclusion:
Therefore, the correct answer is option B, i.e., f to d transition, as f-f transitions are allowed in Ce3+ and Yb3+ due to the large radial extent of the f-orbitals, and the energy required for these transitions falls in the UV region.
UV-Visible spectroscopy is a useful technique to study the electronic transitions in molecules. Ce3+ and Yb3+ are colorless because they do not show any visible color due to the absence of d-d transitions (in case of transition metals) or p-d transitions (in case of lanthanides) in their spectra. However, they show strong absorption in the UV region due to f-f transitions.
In Ce3+ and Yb3+, the electronic configuration of the outermost shell is 4f1 and 4f13, respectively. The f-orbitals of these elements are well-shielded by the 5s and 5p orbitals and do not participate in bonding. As a result, the f-electrons are largely localized and do not interact strongly with the ligands. This leads to weak crystal field splitting and no d-d or p-d transitions are observed.
On the other hand, f-f transitions are allowed in Ce3+ and Yb3+ because the f-orbitals have a large radial extent and can interact with the electric field of light. The energy required for f-f transitions falls in the UV region, hence the strong absorption in this region.
Conclusion:
Therefore, the correct answer is option B, i.e., f to d transition, as f-f transitions are allowed in Ce3+ and Yb3+ due to the large radial extent of the f-orbitals, and the energy required for these transitions falls in the UV region.
Free Test
FREE
| Start Free Test |
Community Answer
Ce3+ and Yb3+ are colourless but show strong absorption in UV region. ...
C
|
Explore Courses for Chemistry exam
|
|
Similar Chemistry Doubts
Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer?
Question Description
Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer?.
Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer? for Chemistry 2024 is part of Chemistry preparation. The Question and answers have been prepared according to the Chemistry exam syllabus. Information about Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer?.
Solutions for Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Chemistry.
Download more important topics, notes, lectures and mock test series for Chemistry Exam by signing up for free.
Here you can find the meaning of Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer?, a detailed solution for Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Ce3+ and Yb3+ are colourless but show strong absorption in UV region. This is due to:a)d-f transitionb)f to d transitionc)Allowed f-f transitiond)d-d transition.Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice Chemistry tests.
|
|
Explore Courses for Chemistry exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup