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Q. No.The E° value for the Mn3+/Mn2+ couple is more positive than that of Cr3+/Cr2+ or Fe3+/Fe2+ due to change of
1. d5 to d2 configuration
2. d4 to d5 configuration
3. d3 to d5 configuration
4. d5 to d4 configuration
1. d5 to d2 configuration
2. d4 to d5 configuration
3. d3 to d5 configuration
4. d5 to d4 configuration
Subtopic: d-Block Elements- Properties & Uses |
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NEET - 2024
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'Spin only' magnetic moment is same for which of the following ions?
A. Ti3+
B. Cr2+
C. Mn2+
D. Fe2+
E. Sc3+
Choose the most appropriate answer from the options given below:
1. A and E only
2. B and C only
3. A and D only
4. B and D only
A. Ti3+
B. Cr2+
C. Mn2+
D. Fe2+
E. Sc3+
Choose the most appropriate answer from the options given below:
1. A and E only
2. B and C only
3. A and D only
4. B and D only
Subtopic: d-Block Elements- Properties & Uses |
72%
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The pair of lanthanoid ions which are diamagnetic is
1. Ce3+ and Eu2+
2. Gd3+ and Eu3+
3. Pm3+ and Sm3+
4. Ce4+ and Yb2+
1. Ce3+ and Eu2+
2. Gd3+ and Eu3+
3. Pm3+ and Sm3+
4. Ce4+ and Yb2+
Subtopic: f-Block Elements- Properties & Uses |
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NEET - 2024
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The behaviour of samarium (Z=62) is very much like europium (Z=63). Since both elements:
| 1. | exhibit +2 and +3 oxidation states. |
| 2. | have \(4 f^5 6 s^2 \) and \(4 f^6 6 s^2\) electronic configurations, respectively. |
| 3. | have \(4 f^7 6 s^2\) and \(4 f^8 6 s^2\) electronic configurations, respectively. |
| 4. | have same atomic radii. |
Subtopic: f-Block Elements- Properties & Uses |
From NCERT
NEET - 2024
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Match List-I with List-II
Choose the correct answer from the options given below:
1. A-II, B-IV, C-I, D-III
2. A-IV, B-II, C-I, D-III
3. A-II, B-I, C-IV, D-III
4. A-I, B-IV, C-II, D-III
| List-I (Element) |
List-II (Most Common oxidation state/s) |
||
| A. | \(\mathrm{Fe}\) | I. | +2, +7 |
| B. | V | II. | +3, +2 |
| C. | \(\mathrm{Mn}\) | III. | +4 |
| D. | \(\mathrm{Ti}\) | IV. | +5 |
1. A-II, B-IV, C-I, D-III
2. A-IV, B-II, C-I, D-III
3. A-II, B-I, C-IV, D-III
4. A-I, B-IV, C-II, D-III
Subtopic: d-Block Elements- Properties & Uses |
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Number of moles of \(\text{MnO}_4^-\) getting reduced to \(\text{Mn}^{2+}\) under acidic condition by \(4.517\times10^{24}\) electrons is:
1. 1.5 moles
2. 7.5 moles
3. 2.5 moles
4. 5.0 moles
1. 1.5 moles
2. 7.5 moles
3. 2.5 moles
4. 5.0 moles
Subtopic: Chemistry of Mn and Cr Compounds |
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The common oxidation state shown by actinoids is +3 with the other oxidation states being +4, +3, +6, and +7. The number of oxidation states shown by the following elements decrease in the order:
A. \(Np(Z-93)\)
B. \(Am(Z-95)\)
C. \(Ac(Z-89)\)
D. \(Pa(Z-91)\)
Choose the correct answer from the options given below:
1. A > B > D > C
2. A > B > C > D
3. B > A > D > C
4. D > B > A > C
A. \(Np(Z-93)\)
B. \(Am(Z-95)\)
C. \(Ac(Z-89)\)
D. \(Pa(Z-91)\)
Choose the correct answer from the options given below:
1. A > B > D > C
2. A > B > C > D
3. B > A > D > C
4. D > B > A > C
Subtopic: f-Block Elements- Properties & Uses |
NEET - 2024
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The stability of Cu2+ is greater than that of Cu+ salts in an aqueous solution due to:
1. Second ionisation enthalpy
2. First ionisation enthalpy
3. Enthalpy of atomization
4. Hydration energy
1. Second ionisation enthalpy
2. First ionisation enthalpy
3. Enthalpy of atomization
4. Hydration energy
Subtopic: d-Block Elements- Properties & Uses |
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NEET - 2023
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Which of the following statements is INCORRECT?
Choose the correct answer from the options given below:
| A. | All the transition metals except scandium form MO oxides which are ionic. |
| B. | The highest oxidation number corresponding to the group number on transition metal oxides is attained in Sc2O3 to Mn2O7. |
| C. | Basic character increases from V2O3 to V2O4 to V2O5. |
| D. | V2O4 dissolves in acids to give VO43-. |
| E. | CrO is basic but Cr2O3 is amphoteric. |
| 1. | B and C only | 2. | A and E only |
| 3. | B and D only | 4. | C and D only |
Subtopic: d-Block Elements- Properties & Uses |
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| Assertion (A): | Ionization enthalpy increases along each series of transition elements from left to right. However, small variations occur. |
| Reason (R): | There is a corresponding increase in nuclear charge which accompanies the filling of electrons in the inner d-orbitals. |
| 1. | (A) is correct but (R) is not correct |
| 2. | (A) is not correct but (R) is correct |
| 3. | Both (A) and (R) are correct and (R) is the correct explanation of (A) |
| 4. | Both (A) and (R) are correct but (R) is not the correct explanation of (A) |
Subtopic: d-Block Elements- Properties & Uses |
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