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  • 1(current)
Q. No.

Because of lanthanoid contraction, which of the following pairs of elements have nearly

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
Consider the following statements
I: La(OH)3 is least basic among hydroxides of lanthanides.
II: Zr4+ and Hf4+ possess almost the same ionic radii.
III: Ce4+ can act as an oxidising agent.
True statements among the following is /are:
1. I and III
2. II and III
3. II only 
4. I and II 
Subtopic:  f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
 82%
Level 1: 80%+
Please attempt this question first.
Hints
Please attempt this question first.

Which of the following elements generally exhibit multiple oxidation states and form coloured ions in aqueous solution?

1. Metalloids

2. Transition elements

3. Non-metals

4. Noble gases

Subtopic:  Lanthanoid & Actinoids Contraction |
 94%
Level 1: 80%+
Hints
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A colored ion in aqueous solutions among the following is:

1. La3+ (Z=57)

2. Ti3+ (Z=22)

3. Lu3+ (Z=71)

4. Sc3+ (Z=21)

Subtopic:  Lanthanoid & Actinoids Contraction |
 88%
Level 1: 80%+
AIPMT - 2010
Hints

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

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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Statement I: Actinoid contraction is greater from element to element than lanthanoid contraction. 
Statement II:  5f orbitals have a poorer shielding effect than 4f orbitals.
   
1. Statement I is True and Statement II is False.
2. Statement I is False and Statement II is True.
3. Both Statement I and Statement II are False.
4. Both Statement I and Statement II are True.
Subtopic:  Lanthanoid & Actinoids Contraction |
 83%
Level 1: 80%+
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 |
 80%
Level 1: 80%+
AIPMT - 2011
Hints
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