- 1(current)
Q. No.A 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 & BiologyThe 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.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | The greater metallic character of the lanthanoids than that of the corresponding actinoids. |
| 2. | More energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals. |
| 3. | The lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals. |
| 4. | More active nature of the actinoids. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following ions will exhibit colour in aqueous solutions?
1. La3+ (Z=57)
2. Ti3+ (Z=22)
3. Lu3+ (Z=71)
4. Sc3+ (Z=21)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIdentify the incorrect statement among the following:
| 1. | There is a decrease in the radii of the atoms or ions as one proceeds from La to Lu. |
| 2. | Lanthanoid contraction is the accumulation of successive shrinkages |
| 3. | As a result of lanthanoid contraction, the properties of the 4d series of the transition elements have no similarities with the 5d series of elements |
| 4. | The shielding power of 4f electrons is quite weak. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology- 1(current)
Q. No.
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