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Which of the following ions will exhibit colour in aqueous solutions? [2010]
- a)La 3+ (Z = 57)
- b)Ti3+ (Z = 22)
- c)Lu 3+ (Z = 71)
- d)Sc3+ (Z = 21)
Correct answer is option 'B'. Can you explain this answer?
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Which of the following ions will exhibit colour in aqueous solutions? ...
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Which of the following ions will exhibit colour in aqueous solutions? ...
Explanation:
In order to identify which ions will exhibit color in aqueous solutions, we need to consider the electronic configuration and the presence of unpaired electrons in the d-orbitals of the ion.
Electronic Configuration:
a) La3+ (Z = 57): The electronic configuration of La3+ is [Xe] 4f0 5d0 6s0. It does not have any d-orbitals to exhibit color.
b) Ti3+ (Z = 22): The electronic configuration of Ti3+ is [Ar] 3d1. It has one unpaired electron in the d-orbital, which can absorb light in the visible region and hence exhibit color.
c) Lu3+ (Z = 71): The electronic configuration of Lu3+ is [Xe] 4f14 5d0 6s0. It does not have any d-orbitals to exhibit color.
d) Sc3+ (Z = 21): The electronic configuration of Sc3+ is [Ar] 3d0. It does not have any unpaired electrons in the d-orbitals to exhibit color.
Presence of Unpaired Electrons:
In order for an ion to exhibit color, it must have unpaired electrons in the d-orbitals. This is because when a transition metal ion absorbs light in the visible region, an electron is promoted from a lower energy d-orbital to a higher energy d-orbital. The energy difference between these orbitals corresponds to a particular wavelength of light, which is absorbed and gives the ion its color.
Conclusion:
Among the given ions, only Ti3+ (Z = 22) has an unpaired electron in the d-orbital, allowing it to absorb light in the visible region and exhibit color. Therefore, the correct answer is option B.
In order to identify which ions will exhibit color in aqueous solutions, we need to consider the electronic configuration and the presence of unpaired electrons in the d-orbitals of the ion.
Electronic Configuration:
a) La3+ (Z = 57): The electronic configuration of La3+ is [Xe] 4f0 5d0 6s0. It does not have any d-orbitals to exhibit color.
b) Ti3+ (Z = 22): The electronic configuration of Ti3+ is [Ar] 3d1. It has one unpaired electron in the d-orbital, which can absorb light in the visible region and hence exhibit color.
c) Lu3+ (Z = 71): The electronic configuration of Lu3+ is [Xe] 4f14 5d0 6s0. It does not have any d-orbitals to exhibit color.
d) Sc3+ (Z = 21): The electronic configuration of Sc3+ is [Ar] 3d0. It does not have any unpaired electrons in the d-orbitals to exhibit color.
Presence of Unpaired Electrons:
In order for an ion to exhibit color, it must have unpaired electrons in the d-orbitals. This is because when a transition metal ion absorbs light in the visible region, an electron is promoted from a lower energy d-orbital to a higher energy d-orbital. The energy difference between these orbitals corresponds to a particular wavelength of light, which is absorbed and gives the ion its color.
Conclusion:
Among the given ions, only Ti3+ (Z = 22) has an unpaired electron in the d-orbital, allowing it to absorb light in the visible region and exhibit color. Therefore, the correct answer is option B.
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Which of the following ions will exhibit colour in aqueous solutions? [2010]a)La 3+ (Z = 57)b)Ti3+ (Z = 22)c)Lu 3+ (Z = 71)d)Sc3+ (Z = 21)Correct answer is option 'B'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Which of the following ions will exhibit colour in aqueous solutions? [2010]a)La 3+ (Z = 57)b)Ti3+ (Z = 22)c)Lu 3+ (Z = 71)d)Sc3+ (Z = 21)Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following ions will exhibit colour in aqueous solutions? [2010]a)La 3+ (Z = 57)b)Ti3+ (Z = 22)c)Lu 3+ (Z = 71)d)Sc3+ (Z = 21)Correct answer is option 'B'. Can you explain this answer?.
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Which of the following ions will exhibit colour in aqueous solutions? [2010]a)La 3+ (Z = 57)b)Ti3+ (Z = 22)c)Lu 3+ (Z = 71)d)Sc3+ (Z = 21)Correct answer is option 'B'. Can you explain this answer?, a detailed solution for Which of the following ions will exhibit colour in aqueous solutions? [2010]a)La 3+ (Z = 57)b)Ti3+ (Z = 22)c)Lu 3+ (Z = 71)d)Sc3+ (Z = 21)Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of Which of the following ions will exhibit colour in aqueous solutions? [2010]a)La 3+ (Z = 57)b)Ti3+ (Z = 22)c)Lu 3+ (Z = 71)d)Sc3+ (Z = 21)Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
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