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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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The lanthanide ion having four unpaired electrons is :
(Given : Atomic numbers of Ce = 58, Nd = 60, Tb = 65 and Ho = 67)
(Given : Atomic numbers of Ce = 58, Nd = 60, Tb = 65 and Ho = 67)
| 1. | Ho3+ | 2. | Nd3+ |
| 3. | Ce3+ | 4. | Tb3+ |
Subtopic: f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
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The green paramagnetic species formed by heating KMnO4 at 513 K is:
| 1. | KO2 |
| 2. | K2MnO4 |
| 3. | Mn3O4 |
| 4. | MnO |
Subtopic: d-Block Elements- Properties & Uses |
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Given below are two statements:
In light of the above statements, choose the most appropriate answer from the options given below.
| Statement I: | Heating NaCl with concentrated \(H_2SO_4\) and \(MnO_2\) results in oxidation of Mn. |
| Statement II: | Heating NaI with concentrated \(H_2SO_4\) and \(MnO_2\) results in reduction of Mn. |
In light of the above statements, choose the most appropriate answer from the options given below.
| 1. | Statement I is incorrect but Statement II is correct. |
| 2. | Both Statement I and Statement II are correct. |
| 3. | Both Statement I and Statement II are incorrect. |
| 4. | Statement I is correct but Statement II is incorrect. |
Subtopic: Chemistry of Mn and Cr Compounds |
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Among the species given below, the spin-only magnetic moment is highest for
(Given: Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)
(Given: Atomic number of Ti = 22, Mn = 25, Fe = 26 and Co = 27)
| 1. | [Ti(H2O)6]3+ |
| 2. | [Mn(CN)6]3- |
| 3. | [Fe(CN)6]3- |
| 4. | [Co(NH3)6]3+ |
Subtopic: d-Block Elements- Properties & Uses |
Level 3: 35%-60%
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Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
In light of the above statements, choose the most appropriate answer from the options given below:
| Assertion (A): | Generally, 3d transition metals have high melting points. |
| Reason (R): | Involvement of 3d-electrons in addition to 4s-electrons in the interatomic metallic bonding. |
| 1. | (A) is not correct but (R) is correct. |
| 2. | Both (A) and (R) are correct and (R) is the correct explanation of (A). |
| 3. | Both (A) and (R) are correct and (R) is NOT the correct explanation of (A). |
| 4. | (A) is correct but (R) is not correct. |
Subtopic: d-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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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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