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Q. No.Which of the following is a result of the lanthanide contraction?
1. Zr and Y have nearly the same atomic radius.
2. Zr and Zn have the same oxidation state.
3. Zr and Hf have nearly the same atomic radius.
4. Zr and Nb have similar oxidation states.
The incorrect statement among the following is:
| 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. |
A pair among the following that have the same size is:
1. Fe3+, Ni2+
2. Zr4+, Ti4+
3. Zr4+ , Hf4+
4. Zn2+, Hf4+
The consequence(s) of lanthanoid contraction is/are :
| 1. | Similarity in the properties of second and third transition series. |
| 2. | Separation of lanthanoids is difficult. |
| 3. | Variation in the basic strength of lanthanide hydroxides. |
| 4. | All of the above. |
The reason for lanthanoid contraction is:
1. Negligible screening effect of 'f' orbitals
2. Increasing nuclear charge
3. Decreasing nuclear charge
4. Decreasing screening effect
Actinide contraction is
mainly related to:
1. Poor shielding by 5f subshell
2. Extraordinary decrement in Zeff
3. Both (1) and (2)
4. Strong shielding by 5f subshel
The three lanthanides that show a +2 oxidation state are:
1. Sm, Tb, Gd
2. Sm, Eu, Yb
3. La, Gd, Lu
4. Yb, Pm, Sm
The incorrect statement among the following regarding Cerium is :
| 1. | The +4 oxidation state of cerium is not known in solutions. |
| 2. | The +3 oxidation state of cerium is more stable than the +4 oxidation state. |
| 3. | The common oxidation states of cerium are +3, and +4. |
| 4. | Cerium (IV) acts as an oxidizing agent. |
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Q. No.
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