Q. No.Identify 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.
The reason for a greater range of oxidation states in actinoids is attributed to:
1. Actinoid contraction
2. 5f, 6d and 7s levels having comparable energies.
3. 4f and 5d levels being close in energies.
4. The radioactive nature of actinoids
| 1. | \(\mathrm{CrO}_4^{2-} \) | 2. | \(\mathrm{Cr}_2 \mathrm{O}_7^{2-} \) |
| 3. | \(\mathrm{MnO}_4^{-} \) | 4. | \(\mathrm{MnO}_4^{2-}\) |
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II
and select the correct match:
| Column I | Column II |
| A. Co3+ | i. √8 B.M. |
| B. Cr3+ | ii. √35 B.M. |
| C. Fe3+ | iii. √15 B.M. |
| D. Ni2+ | iv. √24 B.M. |
| A | B | C | D | |
| 1. | iv | iii | ii | i |
| 2. | i | ii | iii | iv |
| 3. | iv | i | ii | iii |
| 4. | iii | iv | i | ii |
When copper is heated with conc. HNO3 it produces:
1. Cu(NO3) and NO
2. Cu(NO3)2, NO and NO2
3. Cu(NO3)2 and N2O
4. Cu(NO3)2 and NO2
SO2 is passed through an acidified K2Cr2O7 solution.
The correct statement among the following regarding the above experiment is:
1. The solution gets decolorized.
2. SO2 gets reduced.
3. Green coloured Cr2(SO4)3 gets formed.
4. The solution turns blue.
Gadolinium 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.
Assuming complete ionization, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complex oxidation?
1.
2.
3.
4.
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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