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Q. No.Identify the pair of Lanthanoides with one strong oxidant and one strong reductant:
1.
Ce(IV), Tb(IV)
2.
Yb(II), Eu(II)
3.
Eu(IV), Lu(III)
4.
Ce(IV), Eu(II)
Subtopic: d-Block Elements- Properties & Uses |
72%
Level 2: 60%+
NEET - 2022
Hints
The decrease in size from left to right in the actinoid series is greater and more gradual than that in the lanthanoid series due to:
| 1. | 4f orbitals are penultimate |
| 2. | 4f orbitals have a greater shielding effect |
| 3. | 5f orbitals have a poor shielding effect |
| 4. | 5f orbitals have a greater shielding effect |
Subtopic: Lanthanoid & Actinoids Contraction |
79%
Level 2: 60%+
NEET - 2022
Hints
Given below are two statements:
In light of the above statements, choose the most appropriate answer from the options given below:
| Statement I: | Cr2+ is oxidising agent and Mn3+ is a reducing agent in nature. |
| Statement II: | Sc3+ compounds are repelled by the applied magnetic field. |
| 1. | Both I and II are correct. |
| 2. | Both I and II are incorrect. |
| 3. | I is correct but II is incorrect. |
| 4. | I is incorrect but II is correct. |
Subtopic: d-Block Elements- Properties & Uses |
54%
Level 3: 35%-60%
NEET - 2022
Hints
Match the statements given in List I with the corresponding element given in List II:
| List-I (Characteristics) |
List-II (Elements) |
||
| (a) | Element that exhibits +3 oxidation state only. | (i) | Mn |
| (b) | An element that exhibits more number of oxidation states. | (ii) | Zn |
| (c) | Element which is a reducing agent in its +2 oxidation state. | (iii) | Sc |
| (d) | An element that is not considered as a transition element. | (iv) | Cr |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (iii) | (iv) | (i) | (ii) |
| 2. | (iv) | (i) | (ii) | (iii) |
| 3. | (ii) | (iv) | (iii) | (i) |
| 4. | (iii) | (i) | (iv) | (ii) |
Subtopic: d-Block Elements- Properties & Uses |
84%
Level 1: 80%+
NEET - 2022
Hints
In the neutral or faintly alkaline medium, \(KMnO_4 \) oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from:
| 1. | +6 to +5 | 2. | +7 to +4 |
| 3. | +6 to +4 | 4. | +7 to +3 |
Subtopic: d-Block Elements- Properties & Uses |
74%
Level 2: 60%+
NEET - 2022
Hints
Gadolinium has a low value of third ionisation enthalpy because of:
| 1. | High basic character | 2. | Small size |
| 3. | High exchange enthalpy | 4. | High electronegativity |
Subtopic: f-Block Elements- Properties & Uses |
70%
Level 2: 60%+
NEET - 2022
Hints
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 |
73%
Level 2: 60%+
NEET - 2023
Hints
Which of the following statements is incorrect?
Choose the correct answer from the options given below:
| A. | All the transition metals except scandium form MO oxides which are ionic. |
| B. | The highest oxidation number corresponds to the group number in transition metal oxides is attained in Sc2O3 to Mn2O7. |
| C. | Basic character increases from V2O3 to V2O4 to V2O5. |
| D. | V2O4 dissolves in acids to give VO43-. |
| E. | CrO is basic, but Cr2O3 is amphoteric. |
| 1. | B and C only | 2. | A and E only |
| 3. | B and D only | 4. | C and D only |
Subtopic: d-Block Elements- Properties & Uses |
53%
Level 3: 35%-60%
NEET - 2023
Hints
| Assertion (A): | Ionization enthalpy increases along each series of transition elements from left to right. However, small variations occur. |
| Reason (R): | There is a corresponding increase in nuclear charge which accompanies the filling of electrons in the inner d-orbitals. |
| 1. | (A) is correct but (R) is not correct |
| 2. | (A) is not correct but (R) is correct |
| 3. | Both (A) and (R) are correct and (R) is the correct explanation of (A) |
| 4. | Both (A) and (R) are correct but (R) is not the correct explanation of (A) |
Subtopic: d-Block Elements- Properties & Uses |
73%
Level 2: 60%+
NEET - 2023
Hints
Given below are two statements:
| Assertion (A): | Ionisation enthalpies of early actinoids are lower than early lanthanoids. |
| Reason (R): | Electrons entering 5f orbitals in actinoids experience greater shielding from the nuclear charge. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: f-Block Elements- Properties & Uses |
Level 3: 35%-60%
NEET - 2023
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