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Q. No.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
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 |
91%
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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 |
85%
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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 |
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For M2+/M, and M3+/M2+, the values of some metals are given in the table below:
| Cr+2/Cr = -0.9 V | Cr+3/Cr+2 = -0.4V |
| Mn+2/Mn = -1.2V | Mn+3/Mn+2 = +1.5 V |
| Fe+2/Fe = -0.4V | Fe+3/Fe+2 = +0.8 V |
The correct inference(s) from the above data is/are:
| 1. | The increasing order of their stability is Mn3+< Fe3+< Cr3+ |
| 2. | The increasing order of the above-mentioned metals ability to get oxidized is: Fe < Cr < Mn |
| 3. | The increasing order of the above-mentioned metals ability to get oxidized is: Fe > Cr > Mn |
| 4. | Both 1 and 2 |
Subtopic: d-Block Elements- Properties & Uses |
65%
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Consider the following graph.
Based on the graph above, it can be concluded that the element with a melting point higher than 3000 K will be:
| 1. | Y | 2. | X |
| 3. | Z | 4. | None of the above |
Subtopic: d-Block Elements- Properties & Uses |
90%
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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 |
72%
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The value for copper is positive (+0.34 V), because
| 1. | Copper has a high energy of atomization and a low hydration energy |
| 2. | Copper has low energy of atomization and high hydration energy. |
| 3. | Copper has equal energy of atomization and hydration energy. |
| 4. | None of the above. |
Subtopic: d-Block Elements- Properties & Uses |
59%
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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 |
64%
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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 |
89%
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Subtopic: f-Block Elements- Properties & Uses |
93%
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