- 1(current)
Q. No.The pair of lanthanoid ions which are diamagnetic is
1. Ce3+ and Eu2+
2. Gd3+ and Eu3+
3. Pm3+ and Sm3+
4. Ce4+ and Yb2+
1. Ce3+ and Eu2+
2. Gd3+ and Eu3+
3. Pm3+ and Sm3+
4. Ce4+ and Yb2+
Subtopic: Â f-Block Elements- Properties & Uses |
 60%
From NCERT
NEET - 2024
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The behaviour of samarium (Z=62) is very much like europium (Z=63). Since both elements:
| 1. | exhibit +2 and +3 oxidation states. |
| 2. | have \(4 f^5 6 s^2 \) and \(4 f^6 6 s^2\) electronic configurations, respectively. |
| 3. | have \(4 f^7 6 s^2\) and \(4 f^8 6 s^2\) electronic configurations, respectively. |
| 4. | have same atomic radii. |
Subtopic: Â f-Block Elements- Properties & Uses |
From NCERT
NEET - 2024
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The common oxidation state shown by actinoids is +3 with the other oxidation states being +4, +3, +6, and +7. The number of oxidation states shown by the following elements decrease in the order:
A. \(Np(Z-93)\)
B. \(Am(Z-95)\)
C. \(Ac(Z-89)\)
D. \(Pa(Z-91)\)
Choose the correct answer from the options given below:
1. A > B > D > C
2. A > B > C > D
3. B > A > D > C
4. D > B > A > C
A. \(Np(Z-93)\)
B. \(Am(Z-95)\)
C. \(Ac(Z-89)\)
D. \(Pa(Z-91)\)
Choose the correct answer from the options given below:
1. A > B > D > C
2. A > B > C > D
3. B > A > D > C
4. D > B > A > C
Subtopic: Â f-Block Elements- Properties & Uses |
NEET - 2024
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Given below are two statements:
| Assertion (A): | Ionisation enthalpies of early actinoids are lower than for early lanthanoids. |
| Reason (R): | Electrons are entering 5f orbitals in actinoids which experience greater shielding from nuclear charge. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Â f-Block Elements- Properties & Uses |
From NCERT
NEET - 2023
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Gadolinium has a low value of third ionisation enthalpy because of:
| 1. | high basic character | 2. | small size |
| 3. | high exchange enthalpy | 4. | high electronegativity |
Subtopic: Â f-Block Elements- Properties & Uses |
 68%
From NCERT
NEET - 2022
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NEET 2025 - Target Batch
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NEET 2025 - Target Batch
- 1(current)
Q. No.
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