321717
Which of the following Lanthanoid is radioactive?
1 Cerium
2 Promethium
3 Thulium
4 Lutetium
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321718
The pair of lanthanides in which both elements have high third ionization energy is
1 \(\mathrm{Eu}, \mathrm{Yb}\)
2 \(\mathrm{Lu}, \mathrm{Yb}\)
3 Dy, Gd
4 \(\mathrm{Eu}, \mathrm{Gd}\)
Explanation:
Electronic configuration of \(\mathrm{Eu}^{2+}: 4 \mathrm{f}^{7}\) electronic configuration of \(\mathrm{Yb}^{2+}: 4 \mathrm{f}^{14}\) Due to stable \(+ 2\) configuration, both of these have high third ionization enthalpy.
JEE - 2023
CHXII08:THE D- & F-BLOCK ELEMENTS
321719
Which element in lanthanides is radioactive?
1 Cerium
2 Holmium
3 Promethium
4 Lutetium
Explanation:
Promethium is an radioactive element
CHXII08:THE D- & F-BLOCK ELEMENTS
321720
Assertion : Magnetic moment of Dy is the highest among the lanthanoids. Reason : Orbital motion contributes magnetic moment.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Dysprosium (Dy) exhibits the highest magnetic moment among lanthanoids due to its configuration with seven unpaired electrons in the \(4 \mathrm{f}\) orbitals, contributing to significant magnetic properties. So option (1) is correct.
321717
Which of the following Lanthanoid is radioactive?
1 Cerium
2 Promethium
3 Thulium
4 Lutetium
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321718
The pair of lanthanides in which both elements have high third ionization energy is
1 \(\mathrm{Eu}, \mathrm{Yb}\)
2 \(\mathrm{Lu}, \mathrm{Yb}\)
3 Dy, Gd
4 \(\mathrm{Eu}, \mathrm{Gd}\)
Explanation:
Electronic configuration of \(\mathrm{Eu}^{2+}: 4 \mathrm{f}^{7}\) electronic configuration of \(\mathrm{Yb}^{2+}: 4 \mathrm{f}^{14}\) Due to stable \(+ 2\) configuration, both of these have high third ionization enthalpy.
JEE - 2023
CHXII08:THE D- & F-BLOCK ELEMENTS
321719
Which element in lanthanides is radioactive?
1 Cerium
2 Holmium
3 Promethium
4 Lutetium
Explanation:
Promethium is an radioactive element
CHXII08:THE D- & F-BLOCK ELEMENTS
321720
Assertion : Magnetic moment of Dy is the highest among the lanthanoids. Reason : Orbital motion contributes magnetic moment.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Dysprosium (Dy) exhibits the highest magnetic moment among lanthanoids due to its configuration with seven unpaired electrons in the \(4 \mathrm{f}\) orbitals, contributing to significant magnetic properties. So option (1) is correct.
321717
Which of the following Lanthanoid is radioactive?
1 Cerium
2 Promethium
3 Thulium
4 Lutetium
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321718
The pair of lanthanides in which both elements have high third ionization energy is
1 \(\mathrm{Eu}, \mathrm{Yb}\)
2 \(\mathrm{Lu}, \mathrm{Yb}\)
3 Dy, Gd
4 \(\mathrm{Eu}, \mathrm{Gd}\)
Explanation:
Electronic configuration of \(\mathrm{Eu}^{2+}: 4 \mathrm{f}^{7}\) electronic configuration of \(\mathrm{Yb}^{2+}: 4 \mathrm{f}^{14}\) Due to stable \(+ 2\) configuration, both of these have high third ionization enthalpy.
JEE - 2023
CHXII08:THE D- & F-BLOCK ELEMENTS
321719
Which element in lanthanides is radioactive?
1 Cerium
2 Holmium
3 Promethium
4 Lutetium
Explanation:
Promethium is an radioactive element
CHXII08:THE D- & F-BLOCK ELEMENTS
321720
Assertion : Magnetic moment of Dy is the highest among the lanthanoids. Reason : Orbital motion contributes magnetic moment.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Dysprosium (Dy) exhibits the highest magnetic moment among lanthanoids due to its configuration with seven unpaired electrons in the \(4 \mathrm{f}\) orbitals, contributing to significant magnetic properties. So option (1) is correct.
321717
Which of the following Lanthanoid is radioactive?
1 Cerium
2 Promethium
3 Thulium
4 Lutetium
Explanation:
Conceptual Questions
CHXII08:THE D- & F-BLOCK ELEMENTS
321718
The pair of lanthanides in which both elements have high third ionization energy is
1 \(\mathrm{Eu}, \mathrm{Yb}\)
2 \(\mathrm{Lu}, \mathrm{Yb}\)
3 Dy, Gd
4 \(\mathrm{Eu}, \mathrm{Gd}\)
Explanation:
Electronic configuration of \(\mathrm{Eu}^{2+}: 4 \mathrm{f}^{7}\) electronic configuration of \(\mathrm{Yb}^{2+}: 4 \mathrm{f}^{14}\) Due to stable \(+ 2\) configuration, both of these have high third ionization enthalpy.
JEE - 2023
CHXII08:THE D- & F-BLOCK ELEMENTS
321719
Which element in lanthanides is radioactive?
1 Cerium
2 Holmium
3 Promethium
4 Lutetium
Explanation:
Promethium is an radioactive element
CHXII08:THE D- & F-BLOCK ELEMENTS
321720
Assertion : Magnetic moment of Dy is the highest among the lanthanoids. Reason : Orbital motion contributes magnetic moment.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Dysprosium (Dy) exhibits the highest magnetic moment among lanthanoids due to its configuration with seven unpaired electrons in the \(4 \mathrm{f}\) orbitals, contributing to significant magnetic properties. So option (1) is correct.
