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Q. No.The +2 oxidation state becomes more stable in the first half of the first-row transition elements with increasing atomic number because:
1.
s-Orbital is becoming more and more half-filled.
2.
f-Orbital is becoming more and more half-filled.
3.
d-Orbital is becoming more and more half-filled.
4.
p-Orbital is becoming more and more half-filled.
Subtopic: d-Block Elements- Properties & Uses |
88%
Level 1: 80%+
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The oxo metal anions of the 3d series in which the metal exhibits an oxidation state equal to its group number is /are:
| 1. | 2. | ||
| 3. | 4. | All of these |
Subtopic: d-Block Elements- Properties & Uses |
87%
Level 1: 80%+
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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. |
Subtopic: Lanthanoid & Actinoids Contraction |
84%
Level 1: 80%+
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Which d-block elements are not considered transition elements, and why?
| 1. | Mn, Fe, and Ni because these have partially filled d-subshell. |
| 2. | Mn, Fe, and Ni because these have completely filled d-subshell. |
| 3. | Zn, Cd, and Hg because these have completely filled d-subshell. |
| 4. | Zn, Cd, and Hg because these have partially filled d-subshell. |
Subtopic: d-Block Elements- Properties & Uses |
93%
Level 1: 80%+
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What is the electronic configuration of transition elements?
| 1. | \((n-1) d^{1-10} n s^{0-2} \) | 2. | \((n-1) d^{1-10} n s^2 \) |
| 3. | \(n f^2~ n p^{1-6} \) | 4. | \(n d^2~ n p^{1-6}\) |
Subtopic: d-Block Elements- Properties & Uses |
80%
Level 1: 80%+
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The different oxidation states exhibited by the lanthanoids are:
| 1. | +2, -3, +4 | 2. | -2, -3, -4 |
| 3. | +2, +3, -4 | 4. | +2, +3, +4 |
Subtopic: f-Block Elements- Properties & Uses |
91%
Level 1: 80%+
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The "Disproportionation" reaction means that :
| 1. | A relatively less stable oxidation state undergoes an oxidation−reduction reaction. |
| 2. | A relatively more stable oxidation state undergoes an oxidation−reduction reaction. |
| 3. | A relatively less stable oxidation state undergoes a hydrogenation reaction. |
| 4. | A relatively more stable oxidation state undergoes a hydrogenation reaction. |
Subtopic: d-Block Elements- Properties & Uses |
75%
Level 2: 60%+
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Subtopic: d-Block Elements- Properties & Uses |
75%
Level 2: 60%+
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The number of unpaired electrons in the gaseous ions are, respectively:
| 1. | 3, 2, 3, and 1 | 2. | 2, 2, 3, and 1 |
| 3. | 4, 3, 2, and 1 | 4. | 1, 2, 3, and 4 |
Subtopic: d-Block Elements- Properties & Uses |
89%
Level 1: 80%+
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Subtopic: f-Block Elements- Properties & Uses |
86%
Level 1: 80%+
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