Q. No.1. Ce3+ and Eu2+
2. Gd3+ and Eu3+
3. Pm3+ and Sm3+
4. Ce4+ and Yb2+
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | exhibit +2 and +3 oxidation states. |
| 2. | have \(4 f^5 6 s^2 \) and \(4 f^6 6 s^2\) electronic configurations, respectively. |
| 3. | have \(4 f^7 6 s^2\) and \(4 f^8 6 s^2\) electronic configurations, respectively. |
| 4. | have same atomic radii. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology1. Broad and f orbitals
2. Narrow and f orbitals
3. Broad and d and f orbitals
4. Narrow and d and f orbitals
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| Assertion (A): | Ionisation enthalpies of early actinoids are lower than for early lanthanoids. |
| Reason (R): | Electrons are entering 5f orbitals in actinoids which experience greater shielding from nuclear charge. |
| 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 True but (R) is False. |
| 4. | (A) is False but (R) is True. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | High basic character | 2. | Small size |
| 3. | High exchange enthalpy | 4. | High electronegativity |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIdentify the incorrect statements related to lanthanons:
| 1. | Europium shows +2 oxidation state. |
| 2. | The basicity decreases as the ionic radius decreases from Pr to Lu. |
| 3. | All the lanthanons are much more reactive than aluminium. |
| 4. | Ce+4 solutions are widely used as oxidizing agents in volumetric analysis. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | [Xe] 4f6 5d1 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
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| 2. | [Xe] 4f6 5d1 6s2, [Xe] 4f75d1 6s2, and [Xe]4f8 5d1 6s2
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| 3. | [Xe] 4f7 6s2, [Xe]4f7 5d1 6s2, and [Xe] 4f9 6s2
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| 4. | [Xe] 4f7 6s2, (Xe]4f8 6s2, and [Xe]4f8 5d1 6s2 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyGadolinium belongs to 4f series. It’s atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA pair among the following have nearly the same atomic radii:
(Numbers in the parenthesis are atomic numbers).
2. Zr (40) and Nb (41)
3. Zr (40) and Hf (72)
4. Zr (40) and Ta (73)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology(At nos. Ce = 58, Sm = 62, Eu = 63, Yb = 70)
2. Eu2+
3. Yb2+
4. Ce2+
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology
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