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Which of the following statements is not correct:
- a)La(OH)3 is less basic than Lu(OH)3.
- b)Atomic radius of Zr and Hf are same because of lanthanide contraction.
- c)In lanthanide series ionic radius of Ln3+ ion decreases.
- d)La is actually an element of transition series rather lanthanide
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Which of the following statements is not correct:a)La(OH)3 is less bas...
- Due to lanthanide contraction as the size of lanthanide ions decreases from La3+ to Lu3+, the covalent character of the hydroxides increases, and hence the basic strength decreases.
- Thus, La(OH)3 is the most basic, and Lu(OH)3 is the least basic.
Most Upvoted Answer
Which of the following statements is not correct:a)La(OH)3 is less bas...
Explanation:
La(OH)3 is less basic than Lu(OH)3. This statement is not correct because the basicity of metal hydroxides increases as we move down the group in the periodic table. Therefore, Lu(OH)3 should be less basic than La(OH)3.
Atomic radius of Zr and Hf are same because of lanthanide contraction. This statement is correct. The lanthanide contraction is the phenomenon of the decrease in the size of the elements in the 6th and 7th periods of the periodic table due to the imperfect shielding of the nuclear charge by the f-orbitals. As a result, the atomic radii of the elements in the 5th period are very similar to those in the 6th and 7th periods.
In lanthanide series ionic radius of Ln3 ion decreases. This statement is correct. As we move across the lanthanide series from La to Lu, the atomic number increases, and the number of electrons in the 4f orbitals also increases. This leads to an increase in the effective nuclear charge, which pulls the electrons closer to the nucleus, resulting in a decrease in the ionic radius of the Ln3+ ion.
La is actually an element of the transition series rather than the lanthanide series. This statement is not correct. La is the first element in the lanthanide series, which is a group of 15 elements that have similar chemical and physical properties. The lanthanide series is also known as the rare earth series.
La(OH)3 is less basic than Lu(OH)3. This statement is not correct because the basicity of metal hydroxides increases as we move down the group in the periodic table. Therefore, Lu(OH)3 should be less basic than La(OH)3.
Atomic radius of Zr and Hf are same because of lanthanide contraction. This statement is correct. The lanthanide contraction is the phenomenon of the decrease in the size of the elements in the 6th and 7th periods of the periodic table due to the imperfect shielding of the nuclear charge by the f-orbitals. As a result, the atomic radii of the elements in the 5th period are very similar to those in the 6th and 7th periods.
In lanthanide series ionic radius of Ln3 ion decreases. This statement is correct. As we move across the lanthanide series from La to Lu, the atomic number increases, and the number of electrons in the 4f orbitals also increases. This leads to an increase in the effective nuclear charge, which pulls the electrons closer to the nucleus, resulting in a decrease in the ionic radius of the Ln3+ ion.
La is actually an element of the transition series rather than the lanthanide series. This statement is not correct. La is the first element in the lanthanide series, which is a group of 15 elements that have similar chemical and physical properties. The lanthanide series is also known as the rare earth series.
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Which of the following statements is not correct:a)La(OH)3 is less bas...
Across lanthanoids series size of cation decreases and covalent character increases of hydroxides therefore decreasing basicity
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Which of the following statements is not correct:a)La(OH)3 is less basic than Lu(OH)3.b)Atomic radius of Zr and Hf are same because of lanthanide contraction.c)In lanthanide series ionic radius of Ln3+ ion decreases.d)La is actually an element of transition series rather lanthanideCorrect answer is option 'A'. Can you explain this answer?
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Which of the following statements is not correct:a)La(OH)3 is less basic than Lu(OH)3.b)Atomic radius of Zr and Hf are same because of lanthanide contraction.c)In lanthanide series ionic radius of Ln3+ ion decreases.d)La is actually an element of transition series rather lanthanideCorrect answer is option 'A'. 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 Which of the following statements is not correct:a)La(OH)3 is less basic than Lu(OH)3.b)Atomic radius of Zr and Hf are same because of lanthanide contraction.c)In lanthanide series ionic radius of Ln3+ ion decreases.d)La is actually an element of transition series rather lanthanideCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is not correct:a)La(OH)3 is less basic than Lu(OH)3.b)Atomic radius of Zr and Hf are same because of lanthanide contraction.c)In lanthanide series ionic radius of Ln3+ ion decreases.d)La is actually an element of transition series rather lanthanideCorrect answer is option 'A'. Can you explain this answer?.
Which of the following statements is not correct:a)La(OH)3 is less basic than Lu(OH)3.b)Atomic radius of Zr and Hf are same because of lanthanide contraction.c)In lanthanide series ionic radius of Ln3+ ion decreases.d)La is actually an element of transition series rather lanthanideCorrect answer is option 'A'. 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 Which of the following statements is not correct:a)La(OH)3 is less basic than Lu(OH)3.b)Atomic radius of Zr and Hf are same because of lanthanide contraction.c)In lanthanide series ionic radius of Ln3+ ion decreases.d)La is actually an element of transition series rather lanthanideCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Chemistry 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is not correct:a)La(OH)3 is less basic than Lu(OH)3.b)Atomic radius of Zr and Hf are same because of lanthanide contraction.c)In lanthanide series ionic radius of Ln3+ ion decreases.d)La is actually an element of transition series rather lanthanideCorrect answer is option 'A'. Can you explain this answer?.
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