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The correct statement about Ln3+ ions is
(1) Their magnetic moments increase with increase in number of unpaired electrons
(2) All Ln3+ ions are coloured
(3) The crystal field splitting energy increases with increase in ligand field strength
(4) Most of the Ln3+ ions show sharp bands in their absorption spectra
(1) Their magnetic moments increase with increase in number of unpaired electrons
(2) All Ln3+ ions are coloured
(3) The crystal field splitting energy increases with increase in ligand field strength
(4) Most of the Ln3+ ions show sharp bands in their absorption spectra
- a)only 1
- b)1 and 2
- c)1, 3 and 4
- d)only 4
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
The correct statement about Ln3+ions is(1)Their magnetic moments incre...
(1) The magnetic moment of Ln3+ ions depends on the spin-orbit coupling, not on the number of unpaired electrons.
(2) La3, Ce3+, Gd3+, Yb3+ and Lu3+ colourless
(3) Since, the 4f-orbitals buried deep inside the atom, there is no or little interaction between Ln3+ ions and the ligands. Therefore, zero value does not depend on the nature of ligand.
(4) For the same reason discussed in point 3, most of the Ln3+ ions show sharp peaks.
(2) La3, Ce3+, Gd3+, Yb3+ and Lu3+ colourless
(3) Since, the 4f-orbitals buried deep inside the atom, there is no or little interaction between Ln3+ ions and the ligands. Therefore, zero value does not depend on the nature of ligand.
(4) For the same reason discussed in point 3, most of the Ln3+ ions show sharp peaks.
Most Upvoted Answer
The correct statement about Ln3+ions is(1)Their magnetic moments incre...
The correct statement about Ln3 ions is:
(1) Their magnetic moments increase with an increase in the number of unpaired electrons:
The magnetic moment of an ion is determined by the number of unpaired electrons it possesses. Ln3 ions refer to trivalent lanthanide ions, which have a partially filled f-shell. The number of unpaired electrons in the f-shell can vary from 0 to 7, depending on the lanthanide element. As the number of unpaired electrons increases, the magnetic moment of the ion also increases. Therefore, statement 1 is correct.
(2) All Ln3 ions are colored:
The color of an ion is determined by the electronic transitions that occur within its energy levels. While many Ln3 ions do exhibit characteristic colors, not all of them are colored. The color of an Ln3 ion depends on the specific electronic transitions and the energy difference between the levels involved. Therefore, statement 2 is incorrect.
(3) The crystal field splitting energy increases with an increase in ligand field strength:
The crystal field splitting energy refers to the energy difference between the d-orbitals in a transition metal complex. It depends on the strength of the ligand field, which is determined by the nature of the ligands surrounding the central metal ion. When the ligand field strength increases, the crystal field splitting energy also increases. Therefore, statement 3 is correct.
(4) Most of the Ln3 ions show sharp bands in their absorption spectra:
The absorption spectra of Ln3 ions are characterized by sharp bands due to the transitions between the energy levels of the f-electrons. These transitions are highly specific and result in well-defined absorption peaks. Therefore, statement 4 is correct.
Based on the above analysis, the correct statement about Ln3 ions is option 'D' - only statement 4 is true.
(1) Their magnetic moments increase with an increase in the number of unpaired electrons:
The magnetic moment of an ion is determined by the number of unpaired electrons it possesses. Ln3 ions refer to trivalent lanthanide ions, which have a partially filled f-shell. The number of unpaired electrons in the f-shell can vary from 0 to 7, depending on the lanthanide element. As the number of unpaired electrons increases, the magnetic moment of the ion also increases. Therefore, statement 1 is correct.
(2) All Ln3 ions are colored:
The color of an ion is determined by the electronic transitions that occur within its energy levels. While many Ln3 ions do exhibit characteristic colors, not all of them are colored. The color of an Ln3 ion depends on the specific electronic transitions and the energy difference between the levels involved. Therefore, statement 2 is incorrect.
(3) The crystal field splitting energy increases with an increase in ligand field strength:
The crystal field splitting energy refers to the energy difference between the d-orbitals in a transition metal complex. It depends on the strength of the ligand field, which is determined by the nature of the ligands surrounding the central metal ion. When the ligand field strength increases, the crystal field splitting energy also increases. Therefore, statement 3 is correct.
(4) Most of the Ln3 ions show sharp bands in their absorption spectra:
The absorption spectra of Ln3 ions are characterized by sharp bands due to the transitions between the energy levels of the f-electrons. These transitions are highly specific and result in well-defined absorption peaks. Therefore, statement 4 is correct.
Based on the above analysis, the correct statement about Ln3 ions is option 'D' - only statement 4 is true.
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The correct statement about Ln3+ions is(1)Their magnetic moments increase with increase in number of unpaired electrons(2)All Ln3+ions are coloured(3)The crystal field splitting energy increases with increase in ligand field strength(4)Most of the Ln3+ions show sharp bands in their absorption spectraa)only 1b)1 and 2c)1, 3 and 4d)only 4Correct answer is option 'D'. Can you explain this answer?
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The correct statement about Ln3+ions is(1)Their magnetic moments increase with increase in number of unpaired electrons(2)All Ln3+ions are coloured(3)The crystal field splitting energy increases with increase in ligand field strength(4)Most of the Ln3+ions show sharp bands in their absorption spectraa)only 1b)1 and 2c)1, 3 and 4d)only 4Correct answer is option 'D'. 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 The correct statement about Ln3+ions is(1)Their magnetic moments increase with increase in number of unpaired electrons(2)All Ln3+ions are coloured(3)The crystal field splitting energy increases with increase in ligand field strength(4)Most of the Ln3+ions show sharp bands in their absorption spectraa)only 1b)1 and 2c)1, 3 and 4d)only 4Correct answer is option 'D'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The correct statement about Ln3+ions is(1)Their magnetic moments increase with increase in number of unpaired electrons(2)All Ln3+ions are coloured(3)The crystal field splitting energy increases with increase in ligand field strength(4)Most of the Ln3+ions show sharp bands in their absorption spectraa)only 1b)1 and 2c)1, 3 and 4d)only 4Correct answer is option 'D'. Can you explain this answer?.
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