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Q. No.Match List-I with List-II:
Choose the correct answer from the options given below :
1. A-III, B-IV, C-I, D-II
2. A-II, B-I, C-IV, D-III
3. A-IV, B-I, C-III, D-II
4. A-III, B-I, C-IV, D-II
| List-I (Transition metal/compound/complex) |
List-II (Catalytic Role) |
||
| (a) | \(V_2O_5\) | (i) | Preparation of ammonia from \(N_2/H_2\) mixture |
| (b) | \(Fe\) | (ii) | Polymerisation of alkynes |
| (c) | \(PdCl_2\) | (iii) | Preparation of \(H_2SO_4\) from \(SO_2\) |
| (d) | \(Ni \) complex | (iv) | Oxidation of ethyne to ethanal |
Choose the correct answer from the options given below :
1. A-III, B-IV, C-I, D-II
2. A-II, B-I, C-IV, D-III
3. A-IV, B-I, C-III, D-II
4. A-III, B-I, C-IV, D-II
Subtopic: d-Block Elements- Properties & Uses |
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The calculated 'spin-only' magnetic moment of \(\text{Ti}^{2+}(3d^2) \) is :
1. 2.84 BM
2. 5.92 BM
3. 4.90 BM
4. 3.87 BM
1. 2.84 BM
2. 5.92 BM
3. 4.90 BM
4. 3.87 BM
Subtopic: d-Block Elements- Properties & Uses |
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Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because :
| 1. | Its nearest inert gas is Radon. |
| 2. | After losing one more electron, it acquires \(4f^{14}\) electronic configuration. |
| 3. | Its atomic number is 61. |
| 4. | After losing one more electron, it acquires \(4f^0\) electronic configuration. |
Subtopic: d-Block Elements- Properties & Uses | f-Block Elements- Properties & Uses |
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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). |
| 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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Level 3: 35%-60%
NEET - 2025
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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+ |
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 |
55%
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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 |
50%
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