- 1(current)
Q. No.(Given: Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71]
| 1. | \(\mathrm{Lu}^{3+}\) | 2. | \(\mathrm{Eu}^{2+}\) |
| 3. | \(\mathrm{Tb}^{4+}\) | 4. | \(\mathrm{Ce}^{3+}\) |
Which of the following lanthanoids do not form MO2 [where M is a lanthanoid metal]?
1. Pr
2. Dy
3. Nd
4. Yb
The lanthanoid that does not show +4 oxidation state is:
| 1. | Dysprosium (Dy) | 2. | Europium (Eu) |
| 3. | Cerium (Ce) | 4. | Terbium (Tb) |
The pair that has similar atomic radii is :
1. Mo, and W
2. Mn, and Re
3. Ti, and Hf
4. Sc, and Ni
The common oxidation states associated with cerium (Ce) are:
1. +3 , +4
2. +2, +3
3. +2, +4
4. +3, +5
Ce3+ , La3+ , Pm3+ and Yb3+ have ionic radii in the increasing order as:
1. La3+ < Ce3+ < Pm3+ < Yb3+
2. Yb3+ < Pm3+ < Ce3+ < La3+
3. La3+ = Ce3+ < Pm3+ < Yb3+
4. Yb3+ < Pm3+ < La3+ < Ce3+
The radius of La3+ (Atomic number of La =57) is 1.06 Å. Which one of the following given values will be closest to the radius of Lu3+ (Atomic number of Lu = 71)?
| 1. | 1.60 Å | 2. | 1.40 Å |
| 3. | 1.06 Å | 4. | 0.85 Å |
Which of the following explains the primary cause of lanthanoid contraction?
| 1. | Greater shielding of 5d electrons by 4f electrons. |
| 2. | Poor shielding of 5d electrons by 4f electrons. |
| 3. | Effective shielding of one of the 4f electrons by another in the sub-shell. |
| 4. | Poor shielding of one 4f electron by another within the sub-shell. |
- 1(current)
Q. No.
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