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Q. No.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
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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
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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
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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
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| Assertion(A): | Aquated copper (I) cation undergoes disproportionation as: 2Cu+(aq.)→Cu2+(aq.)+Cu |
| Reason(R): | Hydration energy of Cu2+ is higher than that of Cu+ which compensates second ionization energy of Cu. |
| 1. | Both (A) and (R) are True and (R) is a correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not a correct explanation of (A). |
| 3. | (A) is True but the (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: d-Block Elements- Properties & Uses |
87%
Level 1: 80%+
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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
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The correct electronic configuration of Ytterbium (Yb ,atomic no- 70) is:
1. [Xe]4\(\)f125d26s2
2. [Xe]4f145d26s0
3. [Xe]4f145d16s1
4. [Xe]4f145d06s2
1. [Xe]4\(\)f125d26s2
2. [Xe]4f145d26s0
3. [Xe]4f145d16s1
4. [Xe]4f145d06s2
Subtopic: f-Block Elements- Properties & Uses |
75%
Level 2: 60%+
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Among the following, the element belongs to \(4d \) transition series is:
1. Cu
2. Os
3. Pd
4. Pt
1. Cu
2. Os
3. Pd
4. Pt
Subtopic: d-Block Elements- Properties & Uses |
79%
Level 2: 60%+
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Dichromate ion shows the following equilibrium in an aqueous solution
\(Cr_{2}O_{7}^{2-} + H_{2}O\)
\(2CrO_{4}^{2-} + 2H^{+} \)
The value of X and Y, respectively, are:
1. 4 and 8
2. 8 and 4
3. 7 and 7
4. 4 and 4
\(Cr_{2}O_{7}^{2-} + H_{2}O\)
\(2CrO_{4}^{2-} + 2H^{+} \)The value of X and Y, respectively, are:
1. 4 and 8
2. 8 and 4
3. 7 and 7
4. 4 and 4
Subtopic: Chemistry of Mn and Cr Compounds |
69%
Level 2: 60%+
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The outer electronic configuration of Gd:
( At. No. 64)
1. 4f5 5d4 6s1
2. 4f7 5d1 6s2
3. 4f3 5d5 6s2
4. 4f4 5d5 6s1
( At. No. 64)
1. 4f5 5d4 6s1
2. 4f7 5d1 6s2
3. 4f3 5d5 6s2
4. 4f4 5d5 6s1
Subtopic: f-Block Elements- Properties & Uses |
90%
Level 1: 80%+
NEET - 2013
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