Select Question Set:
Q. No.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
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 |
Subtopic: f-Block Elements- Properties & Uses |
70%
Level 2: 60%+
NEET - 2016
Hints
Subtopic: Chemistry of Mn and Cr Compounds |
56%
Level 3: 35%-60%
Hints
The native silver metal forms a water-soluble complex with a dilute aqueous solution of NaCN in the presence of :
1. Nitrogen
2. Oxygen
3. Carbon dioxide
4. Argon
Subtopic: d-Block Elements- Properties & Uses |
53%
Level 3: 35%-60%
Hints
The incorrect statement among the following regarding Cerium is :
| 1. | The +4 oxidation state of cerium is not known in solutions. |
| 2. | The +3 oxidation state of cerium is more stable than the +4 oxidation state. |
| 3. | The common oxidation states of cerium are +3, and +4. |
| 4. | Cerium (IV) acts as an oxidizing agent. |
Subtopic: Lanthanoid & Actinoids Contraction |
66%
Level 2: 60%+
Hints
The ionization potential values of d-block elements as compared to the ionization potential values of f-block elements are:
| 1. | Higher | 2. | Equal |
| 3. | Lower | 4. | Can't compare. |
Subtopic: d-Block Elements- Properties & Uses |
69%
Level 2: 60%+
Hints
Subtopic: d-Block Elements- Properties & Uses |
57%
Level 3: 35%-60%
Hints
The incorrect statement among the following about the chemistry of 3d and 4f series elements is
| 1. | 3d elements show more oxidation states than 4f series elements. |
| 2. | The energy difference between 3d and 4s orbitals is very little. |
| 3. | Europium (ll) is more stable than Ce (ll). |
| 4. | The paramagnetic character of the 3d series elements increases from scandium to copper. |
Subtopic: d-Block Elements- Properties & Uses |
64%
Level 2: 60%+
Hints
Subtopic: d-Block Elements- Properties & Uses |
62%
Level 2: 60%+
Hints
Find the false statement among the following regarding manganese compounds.
1. MnO₂ dissolves in concentrated HCl, but does not form Mn⁴⁺ ions.2. MnO₂ oxidises hot concentrated H₂SO₄, liberating oxygen.
3. K₂MnO₄ is formed when MnO₂ fused with KOH is oxidised by air, KNO₃, PbO₂, or NaBiO₃.
4. The decomposition of acidic KMnO₄ is not catalysed by sunlight.
Subtopic: d-Block Elements- Properties & Uses |
Level 3: 35%-60%
Hints
Select Question Set:
© 2026 GoodEd Technologies Pvt. Ltd.