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#11 | Lanthanoids & Actanoids
(Chemistry) > The d and f Block Elements

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Related Practice Questions :

Which of the following lanthanoids is radioactive?

1. Promethium

2. Europium

3. Plutonium

4. Neptunium

 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

 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
 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

 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
 69%
Level 2: 60%+
NEET - 2016
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