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Q. No.How many \(M n=O\) (manganese-oxygen double bonds) bonds are present in the compound \(\mathrm{Mn}_2 \mathrm{O}_7\)?
1. 4
2. 5
3. 6
4. 3
Subtopic: Chemistry of Mn and Cr Compounds |
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The most common oxidation state of Lanthanoid elements is \(+3.\) Which of the following is likely to deviate easily from \(+3\) oxidation state?
1. \(\text{Ce}\)(At. No. 58)
2. \(\text{La}\)(At. No. 57)
3. \(\text{Lu}\)(At. No. 71)
4. \(\text{Gd}\)(At. No. 64)
1. \(\text{Ce}\)(At. No. 58)
2. \(\text{La}\)(At. No. 57)
3. \(\text{Lu}\)(At. No. 71)
4. \(\text{Gd}\)(At. No. 64)
Subtopic: f-Block Elements- Properties & Uses |
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The metal ion (in gaseous state) with the lowest value of spin-only magnetic moment is:
| 1. | \(\text{V}^{2+}\) | 2. | \(\text{Ni}^{2+}\) |
| 3. | \(\text{Cr}^{2+}\) | 4. | \(\text{Fe}^{2+}\) |
Subtopic: d-Block Elements- Properties & Uses |
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The number of correct statement(s) from the following for Copper in aqueous medium is/are:
A. \(\text{Cu(II)}\) complexes are always paramagnetic
B. \(\text{Cu(I)}\) complexes are generally colourles
C. \(\text{Cu(I)}\) is easily oxidized
D. In Fehling's solution, the active reagent has \(\text{Cu(I)}\)
1. A and B
2. A, B, and C
3. C and D
4. D only
A. \(\text{Cu(II)}\) complexes are always paramagnetic
B. \(\text{Cu(I)}\) complexes are generally colourles
C. \(\text{Cu(I)}\) is easily oxidized
D. In Fehling's solution, the active reagent has \(\text{Cu(I)}\)
1. A and B
2. A, B, and C
3. C and D
4. D only
Subtopic: d-Block Elements- Properties & Uses |
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Which of the following metal in the 3d transition metal series possesses the highest \(\mathrm{M^{2+}/M}\) standard electrode potential?
1. Chromium (\(\text{Cr}\))
2. Iron (\(\text{Fe}\))
3. Copper (\(\text{Cu}\))
4. Zinc (\(\text{Zn}\))
1. Chromium (\(\text{Cr}\))
2. Iron (\(\text{Fe}\))
3. Copper (\(\text{Cu}\))
4. Zinc (\(\text{Zn}\))
Subtopic: d-Block Elements- Properties & Uses |
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Which of the following pairs of ions of lanthanoids corresponds to half-filled and completely filled 'f' orbitals respectively, based on their electronic configurations? [Given: Atomic no. \(\mathrm{Eu, 63; Sm, 62; Tm, 69; Tb, 65; Yb, 70; Dy, 66]}\)
1. \(\mathrm{Eu^{2+}}\) and \(\mathrm{Tm^{2+}}\)
2. \(\mathrm{Sm^{2+}}\)and \(\mathrm{Tm^{3+}}\)
3. \(\mathrm{Tb^{4+}}\) and \(\mathrm{Yb^{2+}}\)
4. \(\mathrm{Dy^{3+}}\) and \(\mathrm{Yb^{3+}}\)
1. \(\mathrm{Eu^{2+}}\) and \(\mathrm{Tm^{2+}}\)
2. \(\mathrm{Sm^{2+}}\)and \(\mathrm{Tm^{3+}}\)
3. \(\mathrm{Tb^{4+}}\) and \(\mathrm{Yb^{2+}}\)
4. \(\mathrm{Dy^{3+}}\) and \(\mathrm{Yb^{3+}}\)
Subtopic: f-Block Elements- Properties & Uses |
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Which of the following pairs consists of transition metal ions that are colourless?
| 1. | \(\mathrm{Sc}^{3+}, \mathrm{Zn}^{2+}\) | 2. | \(\mathrm{Ti}^{4+}, \mathrm{Cu}^{2+}\) |
| 3. | \(\mathrm{V}^{2+}, \mathrm{Ti}^{3+}\) | 4. | \(\mathrm{Zn}^{2+}, \mathrm{Mn}^{2+}\) |
Subtopic: d-Block Elements- Properties & Uses |
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In a neutral or a faintly alkaline medium, KMnO4 being a powerful oxidant, can oxidize thiosulphate almost quantitatively to sulphate. In this reaction, the overall change in the oxidation state of manganese will be:
| 1. | Five (5) | 2. | One (1) |
| 3. | Zero (0) | 4. | Three (3) |
Subtopic: Chemistry of Mn and Cr Compounds |
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Which of the following statements are correct?
Codes:
| (A) | The electronic configuration of \(\text{Cr}\) is \(\mathrm{[Ar] 3d^54s^1 .}\) |
| (B) | The magnetic quantum number may have a negative value. |
| (C) | In the ground state of an atom, the orbitals are filled in order of their increasing energies. |
| (D) | The total number of nodes is given by \(\mathrm{n – 2.}\) |
| 1. | (A), (C) and (D) only | 2. | (A) and (B) only |
| 3. | (A) and (C) only | 4. | (A), (B), and (C) only |
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 |
Level 3: 35%-60%
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