Class 12 Exam > Class 12 Questions > Knowing that the chemistry of lanthanoids (Ln...
Start Learning for Free
Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the
following statements is incorrect ?
following statements is incorrect ?
- a)The ionic sizes of Ln(III) decrease in general
with increasing atomic number - b)Ln(III) compounds are generally colourless
- c)Ln(III) hydroxides are mainly basic in character
- d)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in character
Correct answer is option 'D'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 ...
Ans.
colour
in solid as well as in solution state due to f-f transition. (Except lanthanum and lutetium)
Most Upvoted Answer
Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 ...
The Incorrect Statement:
The incorrect statement is option 'D', which states that the bonding in lanthanoid compounds is predominantly ionic in character.
Explanation:
- The lanthanoids, also known as lanthanides, are a series of elements in the periodic table with atomic numbers ranging from 57 (lanthanum) to 71 (lutetium).
- The chemistry of lanthanoids is dominated by their +3 oxidation state, in which they lose three electrons to achieve a stable electron configuration.
- Now, let's analyze each option to understand why option 'D' is incorrect.
a) The ionic sizes of Ln(III) decrease in general with increasing atomic number:
- This statement is correct. As we move from lanthanum to lutetium, the atomic number increases, leading to an increase in the number of protons and electrons.
- However, the increase in the number of protons is not sufficient to counteract the shielding effect of the inner electrons, resulting in a decrease in the atomic size.
- Therefore, the ionic sizes of Ln(III) decrease in general with increasing atomic number.
b) Ln(III) compounds are generally colourless:
- This statement is correct. Most lanthanoid compounds in their +3 oxidation state are colorless.
- The color of compounds often arises from the presence of unpaired electrons or specific electron transitions, which are not prevalent in Ln(III) compounds.
c) Ln(III) hydroxides are mainly basic in character:
- This statement is also correct. Ln(III) hydroxides are indeed basic in character.
- The lanthanoids have a strong affinity for oxygen, and when they react with hydroxide ions, they form hydroxides that are basic in nature.
d) Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in character:
- This statement is incorrect. The bonding in lanthanoid compounds is not predominantly ionic in character.
- Lanthanoids exhibit a significant covalent character in their compounds due to the involvement of f-electrons, which have a high probability density near the nucleus.
- The f-electrons participate in covalent bonding, leading to the formation of covalent compounds.
- Additionally, lanthanoids can also form complex ions, which further support their covalent bonding nature.
Therefore, the incorrect statement is option 'D' because the bonding in lanthanoid compounds is not predominantly ionic in character.
The incorrect statement is option 'D', which states that the bonding in lanthanoid compounds is predominantly ionic in character.
Explanation:
- The lanthanoids, also known as lanthanides, are a series of elements in the periodic table with atomic numbers ranging from 57 (lanthanum) to 71 (lutetium).
- The chemistry of lanthanoids is dominated by their +3 oxidation state, in which they lose three electrons to achieve a stable electron configuration.
- Now, let's analyze each option to understand why option 'D' is incorrect.
a) The ionic sizes of Ln(III) decrease in general with increasing atomic number:
- This statement is correct. As we move from lanthanum to lutetium, the atomic number increases, leading to an increase in the number of protons and electrons.
- However, the increase in the number of protons is not sufficient to counteract the shielding effect of the inner electrons, resulting in a decrease in the atomic size.
- Therefore, the ionic sizes of Ln(III) decrease in general with increasing atomic number.
b) Ln(III) compounds are generally colourless:
- This statement is correct. Most lanthanoid compounds in their +3 oxidation state are colorless.
- The color of compounds often arises from the presence of unpaired electrons or specific electron transitions, which are not prevalent in Ln(III) compounds.
c) Ln(III) hydroxides are mainly basic in character:
- This statement is also correct. Ln(III) hydroxides are indeed basic in character.
- The lanthanoids have a strong affinity for oxygen, and when they react with hydroxide ions, they form hydroxides that are basic in nature.
d) Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in character:
- This statement is incorrect. The bonding in lanthanoid compounds is not predominantly ionic in character.
- Lanthanoids exhibit a significant covalent character in their compounds due to the involvement of f-electrons, which have a high probability density near the nucleus.
- The f-electrons participate in covalent bonding, leading to the formation of covalent compounds.
- Additionally, lanthanoids can also form complex ions, which further support their covalent bonding nature.
Therefore, the incorrect statement is option 'D' because the bonding in lanthanoid compounds is not predominantly ionic in character.
Free Test
FREE
| Start Free Test |
Community Answer
Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 ...
Answer:
The most common oxidation state of lanthanoid is +3. Lanthanoids in +3 oxidation state usually have an unpaired electron in f-subshell and impart characteristic colour in solid as well as in solution state due to f-f transition. (Except lanthanum and lutetium)
|
Explore Courses for Class 12 exam
|
|
Similar Class 12 Doubts
Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer?
Question Description
Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer?.
Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer?.
Solutions for Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12.
Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
Here you can find the meaning of Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Knowing that the chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of thefollowing statements is incorrect ?a)The ionic sizes of Ln(III) decrease in generalwith increasing atomic numberb)Ln(III) compounds are generally colourlessc)Ln(III) hydroxides are mainly basic in characterd)Because of the large size of the Ln(III) ions, the bonding in its compounds is predominantly ionic in characterCorrect answer is option 'D'. Can you explain this answer? tests, examples and also practice Class 12 tests.
|
|
Explore Courses for Class 12 exam
|
|
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!
within 7 days!
Takes less than 10 seconds to signup