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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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Which of the following ions have the same 'spin-only' magnetic moment?
A. Ti+3
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 |
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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 |
63%
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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 |
56%
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Match List-I with List-II
Choose the correct answer from the options given below:
| 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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The number of moles of MnO₄⁻ being reduced to Mn²⁺ under acidic conditions by 4.517 × 10²⁴ electrons:
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 |
50%
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Which of the following pairs of ions will have the same spin only magnetic moment values within the pair?
A. \(\mathrm{Zn ^{2+}, Ti ^{2+}}\)
B. \(\mathrm{Cr ^{2+}, Fe ^{2+}}\)
C. \(\mathrm{Ti ^{3+}, Cu ^{2+}}\)
D. \(\mathrm{V ^{2+}, Cu ^{+}}\)
Choose the correct answer from the options given below:
1. C and D only
2. A and D only
3. A and B only
4. B and C only
A. \(\mathrm{Zn ^{2+}, Ti ^{2+}}\)
B. \(\mathrm{Cr ^{2+}, Fe ^{2+}}\)
C. \(\mathrm{Ti ^{3+}, Cu ^{2+}}\)
D. \(\mathrm{V ^{2+}, Cu ^{+}}\)
Choose the correct answer from the options given below:
1. C and D only
2. A and D only
3. A and B only
4. B and C only
Subtopic: d-Block Elements- Properties & Uses |
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Which of the following set of ions act as oxidizing agents?
1. \(\mathrm{Ce}^{4+} \) and \(\mathrm{Tb}^{4+}\)
2. \(\mathrm{La}^{3+} \) and \(\mathrm{Lu}^{3+}\)
3. \(\mathrm{Eu}^{2+} \) and \(\mathrm{Yb}^{2+}\)
4. \(\mathrm{Eu}^{2+} \) and \(\mathrm{Tb}^{4+}\)
1. \(\mathrm{Ce}^{4+} \) and \(\mathrm{Tb}^{4+}\)
2. \(\mathrm{La}^{3+} \) and \(\mathrm{Lu}^{3+}\)
3. \(\mathrm{Eu}^{2+} \) and \(\mathrm{Yb}^{2+}\)
4. \(\mathrm{Eu}^{2+} \) and \(\mathrm{Tb}^{4+}\)
Subtopic: d-Block Elements- Properties & Uses |
71%
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The UV-visible absorption bands in the spectra of lanthanoid ions are 'X', probably because of the excitation of electrons involving 'Y'. The 'X' and 'Y', respectively, are:
1. Broad and f orbitals
2. Narrow and f orbitals
3. Broad and d and f orbitals
4. Narrow and d and f orbitals
1. Broad and f orbitals
2. Narrow and f orbitals
3. Broad and d and f orbitals
4. Narrow and d and f orbitals
Subtopic: f-Block Elements- Properties & Uses |
54%
From NCERT
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 |
71%
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NEET - 2023
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