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Q. No.MnO2 when fused with KOH and oxidized in the air gives a dark green compound X. In an acidic solution, X undergoes disproportionation to give an intense purple compound Y and MnO2.
The compounds X and Y, respectively are:
1. Mn2O7 and KMnO4
2. K2MnO4 and KMnO4
3. KMnO4 and K2MnO4
4. KMnO4 and Mn2O7
Subtopic: Chemistry of Mn and Cr Compounds |
76%
From NCERT
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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%
From NCERT
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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%
From NCERT
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 |
75%
From NCERT
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 |
83%
From NCERT
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 |
71%
From NCERT
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%
From NCERT
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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%
From NCERT
NEET - 2022
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| Statement 1: | Highest oxidation state of a metal is exhibited in its oxide or fluoride only. |
| Statement 2: | Both oxide and fluoride ions are able to oxidise metals. |
| 1. | Statement 1 is true, Statement 2 is false. |
| 2. | Statement 1 is false, Statement 2 is true. |
| 3. | Both Statements 1 and Statement 2 are true. |
| 4. | Both Statements 1 and Statement 2 are false. |
Subtopic: d-Block Elements- Properties & Uses |
77%
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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 |
76%
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