Q. No.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
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.
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)
Which of the following processes does not involve the oxidation of iron?
| 1. | Rusting of iron sheets |
| 2. | Decolourisation of blue CuSO4 solution by iron |
| 3. | Formation of Fe(CO)5 from Fe |
| 4. | Liberation of H2 from steam by iron at high temperature |
The number of d-electrons in Fe2+ (Z = 26) is not equal to the number of:
1. s-electrons in Mg (Z = 12)
2. p-electrons in Cl (Z = 17)
3. d-electrons in Fe (Z = 26)
4. p-electrons in Ne (Z = 10)
The pair of compounds that can exist together is:
1. FeCl3, SnCl2
2. HgCl, SnCl2
3. FeCl2, SnCl2
4. FeCl3, Kl
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