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Which of the following statements is/are correct?
a.
The maximum oxidation state of the d-block elements appears in the middle and the minimum at the extreme ends.
b.
IE1 of the third transition series elements is smaller than IE1 of the second and first transition series elements.
c.
The atomic sizes of the elements in the 3d series are greater than those in the 4d or 5d series.
1. a only
2. a and c only
3. b only
4. b and c only
2. a and c only
3. b only
4. b and c only
Subtopic: d-Block Elements- Properties & Uses |
Level 3: 35%-60%
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The correct statement regarding inner transition elements is:
| 1. | The general electronic configuration of actinoids is |
| 2. | The general electronic configuration of lanthanoids is |
| 3. | Alkalies have no action on actinoids. |
| 4. | The principal oxidation state of lanthanoids is +1. |
Subtopic: f-Block Elements- Properties & Uses |
67%
Level 2: 60%+
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Subtopic: f-Block Elements- Properties & Uses |
94%
Level 1: 80%+
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The correct statement(s) about transition elements is/are:
| 1. | The lowest oxide of a transition metal is basic, the highest is amphoteric/acidic. |
| 2. | A transition metal exhibits the highest oxidation state in oxides and fluorides. |
| 3. | The highest oxidation state is exhibited in the oxoanions of a metal. |
| 4. | All of the above. |
Subtopic: d-Block Elements- Properties & Uses |
90%
Level 1: 80%+
Hints
Which of the following statements is false?
| 1. | Cr2+ is strongly oxidizing while manganese(III) is strongly reducing. |
| 2. | Cobalt(II) is stable in an aqueous solution but in the presence of complexing reagents, it is easily oxidized. |
| 3. | The d1 configuration is very unstable in ions. |
| 4. | None of the above. |
Subtopic: d-Block Elements- Properties & Uses |
68%
Level 2: 60%+
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Which of the following correctly explains the positive value for copper (+0.34 V)?
| 1. | High energy of atomization and a 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 |
60%
Level 2: 60%+
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The correct trend for I.E1 (1st Ionization Enthalpy) in the 3d series is:
| 1. | Ionisation energy regularly decreases on moving along the period. |
| 2. | Ionisation energy regularly increases on moving along the period. |
| 3. | An irregular trend is observed for ionization energy because of electronic configuration. |
| 4. | None of the above. |
Subtopic: d-Block Elements- Properties & Uses |
73%
Level 2: 60%+
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The correct statement(s) regarding the oxidation state of transition elements is/are:
1. The oxidation state can vary from +1 to +7
2. Variable oxidation states are possible.
3. Both (1) and (2)
4. None of the above
Subtopic: d-Block Elements- Properties & Uses |
92%
Level 1: 80%+
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The reaction(s) involved in the preparation of potassium dichromate from iron chromite ore is/are:
| 1. | FeCr2O4 + NaOH + O2 → Na2CrO4 + Fe2O3 + H2O |
| 2. | Na2CrO4 + H2SO4 (conc.) → Na2Cr2O7 + Na2SO4 + H2O |
| 3. | Na2Cr2O7 + KCl→ K2Cr2O7 + NaCl |
| 4. | All of the above. |
Subtopic: Chemistry of Mn and Cr Compounds |
86%
Level 1: 80%+
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An incorrect statement regarding the stability of oxidation state for the elements of the 3d series is:
| 1. | The number of oxidation states increases on moving from Sc to Mn. |
| 2. | The relative stability of the +2 oxidation state increases on moving from top to bottom. |
| 3. | The relative stability of the +2 oxidation state decreases on moving from top to bottom. |
| 4. | Both (1) and (2) |
Subtopic: d-Block Elements- Properties & Uses |
Level 3: 35%-60%
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