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Q. No.Given below are two statements :
In the light of the above statements, choose the correct answer from the options given below :
| Statement I: | Ferromagnetism is considered as an extreme form of paramagnetism. |
| Statement II: | The number of unpaired electrons in a \(Cr^{2+}\)ion (Z=24) is the same as that of a \(Nd^{3+}\) ion (Z=60) |
In the light of the above statements, choose the correct answer from the options given below :
| 1. | Statement I is True but Statement II is False. |
| 2. | Statement I is False but Statement II is True. |
| 3. | Both Statement I and Statement II are True. |
| 4. | Both Statement I and Statement II are False. |
Subtopic: d-Block Elements- Properties & Uses | f-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 |
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, consisting of elements 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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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 the 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:
| 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 \(\mathrm{MnO}_4^{-}\) being reduced to \(\mathrm{Mn}^{2+}\) under acidic conditions by \(4.517 \times 10^{24}\) electrons are:
| 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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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:
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 |
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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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