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Q. No.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 |
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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 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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'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 |
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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 pairs of ions will have 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 oxidising 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 |
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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 |
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