Q. No.Given below are two statements :
In the light of the above statements, choose the correct answer from the options given below:
| Statement I: | Ferromagnetism is considered as an extreme form of paramagnetism. |
| Statement II: | The number of unpaired electrons in a \(Cr^{2+}\)ion (Z = 24) is the same as that of a \(Nd^{3+}\) ion (Z = 60). |
| 1. | Statement I is True but Statement II is False. |
| 2. | Statement I is False but Statement II is True. |
| 3. | Both Statement I and Statement II are True. |
| 4. | Both Statement I and Statement II are False. |
Subtopic: d-Block Elements- Properties & Uses | f-Block Elements- Properties & Uses |
55%
Level 3: 35%-60%
NEET - 2025
Please attempt this question first.
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Please attempt this question first.
The pair of lanthanoid ions, consisting of elements which are diamagnetic, is:
| 1. | Ce3+ and Eu2+ | 2. | Gd3+ and Eu3+ |
| 3. | Pm3+ and Sm3+ | 4. | Ce4+ and Yb2+ |
Subtopic: f-Block Elements- Properties & Uses |
67%
Level 2: 60%+
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 the same atomic radii. |
Subtopic: f-Block Elements- Properties & Uses |
55%
Level 3: 35%-60%
NEET - 2024
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The UV-visible absorption bands in the spectra of lanthanoid ions are 'X', probably because of the excitation of electrons involving 'Y'. The 'X' and 'Y', respectively, are:
1. Broad and f orbitals
2. Narrow and f orbitals
3. Broad and d and f orbitals
4. Narrow and d and f orbitals
1. Broad and f orbitals
2. Narrow and f orbitals
3. Broad and d and f orbitals
4. Narrow and d and f orbitals
Subtopic: f-Block Elements- Properties & Uses |
55%
Level 3: 35%-60%
NEET - 2024
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Given below are two statements:
| Assertion (A): | Ionisation enthalpies of early actinoids are lower than early lanthanoids. |
| Reason (R): | Electrons entering 5f orbitals in actinoids experience greater shielding from the 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: f-Block Elements- Properties & Uses |
Level 3: 35%-60%
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: f-Block Elements- Properties & Uses |
70%
Level 2: 60%+
NEET - 2022
Hints
The incorrect statement among the following is:
| 1. | Lanthanoids are good conductors of heat and electricity. |
| 2. | Actinoids are highly reactive metals, especially when finely divided. |
| 3. | Actinoid contraction is greater for element to element than Lanthanoid contraction. |
| 4. | Most of the trivalent Lanthanoid ions are colourless in the solid-state. |
Subtopic: f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
61%
Level 2: 60%+
NEET - 2021
Hints
Identify the incorrect statements related to lanthanons:
| 1. | Europium shows +2 oxidation state. |
| 2. | The basicity decreases as the ionic radius decreases from Pr to Lu. |
| 3. | All the lanthanons are much more reactive than aluminium. |
| 4. | Ce+4 solutions are widely used as oxidizing agents in volumetric analysis. |
Subtopic: f-Block Elements- Properties & Uses |
69%
Level 2: 60%+
NEET - 2016
Hints
The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64), and Tb (Atomic no. 65) are, respectively:
| 1. | [Xe] 4f6 5d1 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
| 2. | [Xe] 4f6 5d1 6s2, [Xe] 4f75d1 6s2, and [Xe]4f8 5d1 6s2
|
| 3. | [Xe] 4f7 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
|
| 4. | [Xe] 4f7 6s2, (Xe]4f8 6s2, and [Xe]4f8 5d1 6s2 |
Subtopic: f-Block Elements- Properties & Uses |
69%
Level 2: 60%+
NEET - 2016
Hints
Gadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
| 1. | \(\text{ [Xe] } 4f^8 6 d^2\) | 2. | \(\text { [Xe]}4 f^9 5 s^1\) |
| 3. | \(\text { [Xe] } 4f^7 5 d^1 6 s^2\) | 4. | \(\text { [Xe]} 4f^6 5 d^2 6 s^2\) |
Subtopic: f-Block Elements- Properties & Uses |
91%
Level 1: 80%+
NEET - 2015
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