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Q. No.The enthalpy of atomization of zinc is the lowest among the 3d series, because-
1.
It has weak coordinate bond
2.
It has strong metallic bonding
3.
It has strong ionic bonding
4.
It has weak metallic bonding
Subtopic: d-Block Elements- Properties & Uses |
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The transition metal that exhibits the largest number of oxidation states among the following is:
| 1. | Cr | 2. | Mn |
| 3. | Zn | 4. | Sc |
Subtopic: d-Block Elements- Properties & Uses |
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The E0(M2+/M) value for copper is positive (+0.34V) due to:
| 1. | High energy of atomization and low hydration energy |
| 2. | Low energy of atomization and low hydration energy |
| 3. | High energy of atomization and high hydration energy |
| 4. | low energy of atomization and high hydration energy |
Subtopic: d-Block Elements- Properties & Uses |
61%
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The irregular variation of ionization enthalpies (first and second) in the first series of the transition elements is due to:
| 1. | The extra stability of configurations such as d5, d10 |
| 2. | The less stability of configurations such as d5, d10 |
| 3. | The extra stability of configurations such as d4, d6 |
| 4. | The extra stability of configurations such as d7, d8 |
Subtopic: d-Block Elements- Properties & Uses |
92%
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| Statement 1: | Highest oxidation state of a metal is exhibited in its oxide or fluoride only. |
| Statement 2: | Both oxide and fluoride ions are able to oxidise metals. |
| 1. | Statement 1 is true, Statement 2 is false. |
| 2. | Statement 1 is false, Statement 2 is true. |
| 3. | Both Statements 1 and Statement 2 are true. |
| 4. | Both Statements 1 and Statement 2 are false. |
Subtopic: d-Block Elements- Properties & Uses |
77%
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| Statement I: | Cr2+ is a stronger reducing agent than Fe2+ . |
| Statement II: | Fe2+ is a stronger reducing agent than Cr2+ . |
| 1. | Both Statements I and Statement II are true. |
| 2. | Statement I is true and Statement II is false. |
| 3. | Both Statements I and Statement II are false. |
| 4. | Statement I is false, Statement II is true. |
Subtopic: d-Block Elements- Properties & Uses |
68%
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The ‘spin only’ magnetic moment of M2+(aq) ion is :
(Z for 'M' = 27)
1. 3.87 BM
2. 5.10 BM
3. 1.73 BM
4. 2.45 BM
(Z for 'M' = 27)
1. 3.87 BM
2. 5.10 BM
3. 1.73 BM
4. 2.45 BM
Subtopic: d-Block Elements- Properties & Uses |
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Cu+ ion is not stable in aqueous solutions, because:
| 1. | Hydration energy of Cu+2 is more than the ionisation energy for Cu+ |
| 2. | Ionisation energy of Cu+ is more the hydration energy of Cu+2 |
| 3. | Hydration energy of Cu+2 is equal to the ionisation energy of Cu+ |
| 4. | Both (2) and (3) |
Subtopic: d-Block Elements- Properties & Uses |
72%
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| Statement I: | Actinoid contraction is greater from element to element than lanthanoid contraction. |
| Statement II: | 5f orbitals have a poorer shielding effect than 4f orbitals. |
| 1. | Statement I is True and Statement II is False. |
| 2. | Statement I is False and Statement II is True. |
| 3. | Both Statement I and Statement II are False. |
| 4. | Both Statement I and Statement II are True. |
Subtopic: Lanthanoid & Actinoids Contraction |
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| Statement I: | Silver atom has completely filled d orbitals (4d10) in its ground state. |
| Statement II: | Silver is not a transition element. |
| 1. | Statement I is True , Statement II is False. |
| 2. | Statement I is False, Statement II is True. |
| 3. | Both Statement I and Statement II are True. |
| 4. | Both Statement I and Statement II are False. |
Subtopic: d-Block Elements- Properties & Uses |
68%
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