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 colorless in the solid-state.

Subtopic:  d-Block Elements- Properties & Uses |
 56%
From NCERT
NEET - 2021
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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:  d-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
 87%
From NCERT
NEET - 2021
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Match the following aspects with the respective metal.

  Aspects        Metal
(a) The metal which reveals the maximum number of oxidation states (i) Scandium
(b) The metal although placed in a 3d block is not considered as a transition element (ii)  Copper
(c) The metal which does not exhibit variable oxidation states (iii)  Manganese
(d) The metal which in +1 oxidation state in aqueous solution undergoes disproportionation (iv)   Zinc


Select the correct option:

Options: (a) (b) (c) (d)
1. (i) (iv) (ii) (iii)
2. (iii) (iv) (i) (ii)
3. (iii) (i) (iv) (ii)
4. (ii) (iv) (i) (iii)

Subtopic:  d-Block Elements- Properties & Uses |
 83%
From NCERT
NEET - 2020
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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 |
 67%
From NCERT
NEET - 2020
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Gadolinium has a low value of third ionisation enthalpy because of:
1. high basic character 2. small size
3. high exchange enthalpy 4. high electronegativity
Subtopic:  f-Block Elements- Properties & Uses |
 67%
From NCERT
NEET - 2022
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In the neutral or faintly alkaline medium, \(KMnO_4 \) oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from: 
1. +6 to +5  2. +7 to +4 
3. +6 to +4  4. +7 to +3
Subtopic:  d-Block Elements- Properties & Uses |
 73%
From NCERT
NEET - 2022
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Match the statements given in list I with the corresponding element given in list II:

List-I List-II
(a) Element that exhibits +3 oxidation state only. (i) Mn
(b) An element that exhibits more number of oxidation states. (ii) Zn
(c) Element which is a reducing agent in its +2 oxidation state. (iii) Sc
(d) An element that is not considered as a transition element. (iv) Cr
Choose the correct answer from the options given below:
(a) (b) (c) (d)
1. (iii) (iv) (i) (ii)
2. (iv) (i) (ii) (iii)
3. (ii) (iv) (iii) (i)
4. (iii) (i) (iv) (ii)
Subtopic:  d-Block Elements- Properties & Uses |
 80%
From NCERT
NEET - 2022
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Identify the pair of Lanthanoides with one strong oxidant and one strong reductant:

1. Ce(IV), Tb(IV)  2. Yb(II), Eu(II)
3. Eu(IV), Lu(III) 4. Ce(IV), Eu(II)
Subtopic:  d-Block Elements- Properties & Uses |
 67%
From NCERT
NEET - 2022
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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 |
 76%
From NCERT
NEET - 2022
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Given below are two statements:
I: Cr2+ is oxidising and Mn3+ is reducing in nature.
II: Sc3+ compounds are repelled by the applied magnetic field.
In light of the above statements, choose the most appropriate answer from the options given below:
1. Both I and II are correct.
2. Both I and II are incorrect.
3. I is correct but II is incorrect.
4. I is incorrect but II is correct.
Subtopic:  d-Block Elements- Properties & Uses |
From NCERT
NEET - 2022
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NEET 2023 - Target Batch - Aryan Raj Singh
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