- 1(current)
Q. No.In the listed lanthanoids, the element that displays a +2 oxidation state along with the
characteristic +3 oxidation state of lanthanoids is:
(a) Ce
(b) Eu
(c) Yb
(d) Ho
Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Match the compounds/elements given in Column I with uses given in Column II.
| Column (Compound/element) |
Column II (Use) |
||
| A. | Lanthanoid oxide | 1. | Petroleum cracking |
| B. | Lanthanoid | 2. | Television screen |
| C. | Mischmetal | 3. | Lanthanoid metal + iron |
| D. | Mixed oxides of lanthanoids are employed |
4. | Production of iron alloy |
Codes
| Options: | A | B | C | D |
| 1. | 2 | 1 | 4 | 3 |
| 2. | 1 | 2 | 3 | 4 |
| 3. | 2 | 4 | 3 | 1 |
| 4. | 4 | 1 | 3 | 2 |
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 is |
1. +2 2. +3 |
|
B. Most stable oxidation state of Mn is |
3. +4 |
|
C. Most stable oxidation state of Mn in oxides is |
4. +5 |
|
D. Characteristic oxidation state of lanthanoids is |
5. +7 |
Codes
| 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 |
Assertion: Actinoids form relatively less stable complexes as compared to lanthanoids.
Reason: 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. |
- 1(current)
Q. No.
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