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Q. No.What is the difference in the spin-only magnetic moment (in B.M.) between manganese (Mn) in KMnO4 and manganese species in the product (X) of the given reaction?
\(\mathrm{KMnO}_4 \xrightarrow{\mathrm{H}^{+}} \mathrm{X} \text { (product having } \mathrm{Mn} \text { ) }\)
1. 2
2. 4
3. 0
4. 6
\(\mathrm{KMnO}_4 \xrightarrow{\mathrm{H}^{+}} \mathrm{X} \text { (product having } \mathrm{Mn} \text { ) }\)
1. 2
2. 4
3. 0
4. 6
Subtopic: d-Block Elements- Properties & Uses |
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The electronic configuration of Platinum (atomic number: 78) is:
| 1. | \(\mathrm{[Xe] 4f^{14} 5d^9 6s^1}\) | 2. | \(\mathrm{[Kr] 4f^{14} 5d^{10}}\) |
| 3. | \(\mathrm{[Xe] 4f^{14} 5d^{10}}\) | 4. | \(\mathrm{[Xe] 4f^{14} 5d^8 6s^2}\) |
Subtopic: d-Block Elements- Properties & Uses |
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Subtopic: d-Block Elements- Properties & Uses |
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The correct order of the following elements with respect to their density is-
1. Cr < Zn < Co < Cu < Fe
2. Zn < Cu < Co < Fe < Cr
3. Zn < Cr < Fe < Co < Cu
4. Cr < Fe < Co < Cu < Zn
Subtopic: d-Block Elements- Properties & Uses |
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When \(V_2O_5\) reacts with base and acid, X and Y are formed respectively. X and Y are:
1. \(X = VO^{3-}_4 ,~~~Y = VO^{+} _2\)
2. \(X = VO^{3-}_4 ,~~~Y = VO^{+}_4 \)
3. \(X = VO^{+}_4 ,~~~Y = VO^{3-}_4 \)
4. \(X = VO^{2+} ,~~~Y = V_2O_{3} \)
1. \(X = VO^{3-}_4 ,~~~Y = VO^{+} _2\)
2. \(X = VO^{3-}_4 ,~~~Y = VO^{+}_4 \)
3. \(X = VO^{+}_4 ,~~~Y = VO^{3-}_4 \)
4. \(X = VO^{2+} ,~~~Y = V_2O_{3} \)
Subtopic: d-Block Elements- Properties & Uses |
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Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
| Assertion (A): | Ce3+ ion and Yb+3 ion are colourless. |
| Reason (R): | Ce3+ ion and Yb+3 ion cannot show f-f transition |
| 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 |
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Which of the following has the highest negative standard electrode potential ?
1. Ti
2. Cu
3. Mn
4. Zn
Subtopic: d-Block Elements- Properties & Uses |
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What is the reason behind the color of KMnO4?
1. d-d transition
2. Charge transfer spectra
3. Both (1) and (2)
4. Polarisation of anion
1. d-d transition
2. Charge transfer spectra
3. Both (1) and (2)
4. Polarisation of anion
Subtopic: Chemistry of Mn and Cr Compounds |
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How many \(f\) electrons are present in the ground-state electronic configuration of Np (Z = 93)?
| 1. | 18 | 2. | 14 |
| 3. | 4 | 4. | 21 |
Subtopic: f-Block Elements- Properties & Uses |
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Which of the following explains the primary cause of lanthanoid contraction?
| 1. | Greater shielding of 5d electrons by 4f electrons. |
| 2. | Poor shielding of 5d electrons by 4f electrons. |
| 3. | Effective shielding of one of the 4f electrons by another in the sub-shell. |
| 4. | Poor shielding of one 4f electron by another within the sub-shell. |
Subtopic: Lanthanoid & Actinoids Contraction |
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