The most common oxidation state for lanthanoids and actinoids is:

1. +5

2. -3

3. +1

4. +3

Subtopic:  f-Block Elements- Properties & Uses |
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Which one of the following is a diamagnetic ion?

1. La3+  2. Lu3+
3. Ce4+  4. All of the above.
Subtopic:  f-Block Elements- Properties & Uses |
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Actinoids show a greater number of oxidation states than lanthanoids because:  

1. 4f- orbitals are more diffused than 5f-orbitals 
2. Lesser energy difference between 5f, and 6d orbitals than between 4f, and 5d orbitals 
3. More energy difference between 5f, and 6d orbitals than between 4f, and 5d orbitals
4. More reactive nature of the actinoids than the lanthanoids.

Subtopic:  f-Block Elements- Properties & Uses |
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The electronic configuration of the last element of actinoids is :

1. Thorium, Th: Rn5f146d17s2

2. Lawrencium, Lr: Rn5f146d17s2

3. Neptunium, Np: Rn5f146d17s2

4. Protactinium, Pa: Rn5f146d17s2

Subtopic:  f-Block Elements- Properties & Uses |
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The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64), and Tb (Atomic no. 65) are, respectively:
1. [Xe] 4f5d6s2, [Xe]4f5d6s2, and [Xe] 4f6s2
2. [Xe] 4f5d6s2, [Xe] 4f75d1 6s2, and [Xe]4f5d6s2
3. [Xe] 4f6s2, [Xe]4f7 5d6s2, and [Xe] 4f9 6s2
4. [Xe] 4f6s2, (Xe]4f6s2, and [Xe]4f8 5d6s2
Subtopic:  f-Block Elements- Properties & Uses |
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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 |
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Give below are some atomic numbers:

29, 59, 74, 95, 102, 104
The atomic numbers of the inner transition elements among the above are :

1. 29, 59, 74

2. 59, 95, 102

3. 95, 102, 104

4. 59, 74, 95
Subtopic:  f-Block Elements- Properties & Uses |
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