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  • 1(current)
Q. No.
The decrease in size from left to right in the actinoid series is greater and more gradual than that in the lanthanoid series due to:
1. 4f orbitals are penultimate
2. 4f orbitals have a greater shielding effect
3. 5f orbitals have a poor shielding effect
4. 5f orbitals have a greater shielding effect
Subtopic:  Lanthanoid & Actinoids Contraction |
 80%
Level 1: 80%+
NEET - 2022
Hints

Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of: 

1. Lanthanoid contraction
2. Having similar chemical properties
3. Belonging to the same group
4. Diagonal relationship
Subtopic:  Lanthanoid & Actinoids Contraction |
 89%
Level 1: 80%+
NEET - 2021
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 |
 62%
Level 2: 60%+
NEET - 2021
Hints
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Identify the incorrect statement from the following:

1.  Zirconium and Hafnium have identical radii of 160 pm and 159 pm, respectively as a consequence of lanthanoid contraction.
2.  Lanthanoids reveal only +3 oxidation state.
3.  The lanthanoid ions other than the f0 type and the f14 type are all paramagnetic.
4.  The overall decrease in atomic and ionic radii from lanthanum to lutetium is called lanthanoid contraction.

Subtopic:  Lanthanoid & Actinoids Contraction |
 70%
Level 2: 60%+
NEET - 2020
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

The reason for the lanthanoid contraction is:

1. negligible screening effect of 'f' orbitals.

2. increasing nuclear charge.

3. decreasing nuclear charge.

4. decreasing screening effect.

Subtopic:  Lanthanoid & Actinoids Contraction |
 76%
Level 2: 60%+
AIPMT - 2014
Hints
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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 |
 80%
Level 1: 80%+
AIPMT - 2011
Hints

Which of the following ions will exhibit colour in aqueous solutions?

1. La3+ (Z=57)

2. Ti3+ (Z=22)

3. Lu3+ (Z=71)

4. Sc3+ (Z=21)

Subtopic:  Lanthanoid & Actinoids Contraction |
 83%
Level 1: 80%+
AIPMT - 2010
Hints

Identify the incorrect statement among the following:

1. There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu.
2. Lanthanoid contraction is the accumulation of successive shrinkages
3. As a result of lanthanoid contraction, the properties of the 4d series of the transition elements have no similarities with the 5d series of elements
4. The shielding power of 4f electrons is quite weak.

Subtopic:  Lanthanoid & Actinoids Contraction |
 85%
Level 1: 80%+
AIPMT - 2007
Hints
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Which of the following statements correctly describes lanthanoids?

1. 14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevel.
2. 14 elements in the sixth period (atomic no. 58 to 71) that are filling 4f sublevel
3. 14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevel
4. 14 elements in the sixth period (atomic no. 90 to 103) that are filling 4f sublevel
Subtopic:  Lanthanoid & Actinoids Contraction |
 86%
Level 1: 80%+
AIPMT - 2004
Hints
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