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Q. No.Which of the following lanthanoids is radioactive?
1. Promethium
2. Europium
3. Plutonium
4. Neptunium
Subtopic: f-Block Elements- Properties & Uses |
56%
Level 3: 35%-60%
Please attempt this question first.
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Please attempt this question first.
From the following, which is the most basic hydroxide?
1. Ce(OH)3
2. Lu(OH)3
3. Yb(OH)3
4. Tb(OH)3
Subtopic: f-Block Elements- Properties & Uses |
62%
Level 2: 60%+
Hints
The incorrect statement regarding the lanthanons is ;
| 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 oxidising agents in volumetric analysis |
Subtopic: f-Block Elements- Properties & Uses |
64%
Level 2: 60%+
NEET - 2016
Hints
The correct electronic configuration of Gadolinium(Atomic number = 64) is :
1. [Xe]4f86d2
2. [Xe]4f95s1
3. [Xe]4f75d16s2
4. [Xe]4f65d26s2
Subtopic: f-Block Elements- Properties & Uses |
86%
Level 1: 80%+
NEET - 2015
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
Hints
A pair among the following have nearly the same atomic radii:
(Numbers in the parenthesis are atomic numbers).
| 1. | Ti (22) and Zr (40) | 2. | Zr (40) and Nb (41) |
| 3. | Zr (40) and Hf (72) | 4. | Zr (40) and Ta (73) |
Subtopic: f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
91%
Level 1: 80%+
NEET - 2015
Hints
Actinoids exhibit more number of oxidation states than lanthanoids. It is because of:
| 1. | The greater metallic character of the lanthanoids than that of the corresponding actinoids. |
| 2. | More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals. |
| 3. | The lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals. |
| 4. | More active nature of the actinoids. |
Subtopic: d-Block Elements- Properties & Uses | f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
81%
Level 1: 80%+
AIPMT - 2011
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Subtopic: f-Block Elements- Properties & Uses |
88%
Level 1: 80%+
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Subtopic: f-Block Elements- Properties & Uses |
64%
Level 2: 60%+
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