- 1(current)
Q. No.| Assertion (A): | Actinoids form relatively less stable complexes as compared to lanthanoids. |
| Reason (R): | Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is not True but (R) is True. |
| 4. | Both (A) and (R) are False. |
Subtopic: Â Lanthanoid & Actinoids Contraction |
Level 4: Below 35%
Hints
| 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: Â Lanthanoid & Actinoids Contraction |
 82%
Level 1: 80%+
Hints
Match the statements given in Column I with the oxidation states given in Column and mark the correct option.
| Column I | Column II | ||
| A. | Oxidation state of Mn in \(\mathrm{MnO}_2\) is | 1. | +2 |
| B. | Most stable oxidation state of Mn is | 2. | +3 |
| C. | Most stable oxidation state of Mn in oxides is | 3. | +4 |
| D. | Characteristic oxidation state of lanthanoids is | 4. | +5 |
| 5. | +7 |
| Options: | A | B | C | D |
| 1. | 2 | 3 | 4 | 1 |
| 2. | 3 | 1 | 5 | 2 |
| 3. | 5 | 4 | 3 | 2 |
| 4. | 4 | 5 | 3 | 2 |
Subtopic: Â Lanthanoid & Actinoids Contraction |
 88%
Level 1: 80%+
Hints
Match Compound/element in Column-I with uses in Column-II and select the best match from the codes given:
| Column-I (Compound/element) |
Column-II (Uses) |
||
| A. | Lanthanoid oxide | I. | Petroleum cracking |
| B. | Lanthanoid | II. | Television screen |
| C. | Mischmetal | III. | Lanthanoid metal + iron |
| D. | Mixed oxides of lanthanoids are employed | IV. | Production of iron alloy |
| Options: | A | B | C | D |
| 1. | II | I | IV | III |
| 2. | I | II | III | IV |
| 3. | II | IV | III | I |
| 4. | IV | I | III | II |
Subtopic: Â Lanthanoid & Actinoids Contraction |
 56%
Level 3: 35%-60%
Hints
- 1(current)
Q. No.
© 2025 GoodEd Technologies Pvt. Ltd.