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Q. No.\(\mathrm{MnO}_4^{2-}\) in acidic medium, disproportionates to :
1. \(Mn_2O_7\) and MnO
2. \(MnO^-_4\) and MnO
3. \(MnO^-_4\) and \(MnO_4\)
4. \(MnO^-_4\) and \(MnO_2\)
Subtopic: Chemistry of Mn and Cr Compounds |
Level 4: Below 35%
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Among the following \(V^{3+}, Ti^{2+} , Ni^{2+}, Fe^{2+}, Co^{2+}\) for which spin only magnetic moment > 3, and which can form high spin octahedral complex. Find the sum of unpaired electrons in those complexes.
1. 5
2. 7
3. 9
4. 0
1. 5
2. 7
3. 9
4. 0
Subtopic: d-Block Elements- Properties & Uses |
Level 4: Below 35%
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Element 'X' is the lightest element of group 7 of periodic table which forms oxo-anion in +6 oxidation state. The colour of potassium salt of the oxo-anion is:
1. Green
2. Orange
3. Yellow
4. Brown
1. Green
2. Orange
3. Yellow
4. Brown
Subtopic: Chemistry of Mn and Cr Compounds |
Level 4: Below 35%
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Hints
How many of the following are mixed oxides?
\(\mathrm{Cr}_2 \mathrm{O}_3, \mathrm{Mn}_3 \mathrm{O}_4, \mathrm{Fe}_3 \mathrm{O}_4, \mathrm{Fe}_2 \mathrm{O}_3, \mathrm{~V}_2 \mathrm{O}_4, \mathrm{~Pb}_3 \mathrm{O}_4\)
1. Two
2. Five
3. Three
4. Zero
\(\mathrm{Cr}_2 \mathrm{O}_3, \mathrm{Mn}_3 \mathrm{O}_4, \mathrm{Fe}_3 \mathrm{O}_4, \mathrm{Fe}_2 \mathrm{O}_3, \mathrm{~V}_2 \mathrm{O}_4, \mathrm{~Pb}_3 \mathrm{O}_4\)
1. Two
2. Five
3. Three
4. Zero
Subtopic: d-Block Elements- Properties & Uses |
69%
Level 2: 60%+
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An element ‘M’ does not evolve \(H_2\) gas on treatment with dilute HCl. \(MSO_4\) (1 mol) on treatment with excess KCN forms a compound ‘P’. The amount of MS formed (in moles) when \( H_2S\) gas is passed through compound ‘P’ is :
1. 0
2. 1
3. 2
4. 3
1. 0
2. 1
3. 2
4. 3
Subtopic: d-Block Elements- Properties & Uses |
Level 3: 35%-60%
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Hints
The oxidation state of ‘Cr’ in the final product formed by reaction between KI and acidified \(K_2Cr_2O_7\) is :
1. +2
2. +6
3. +4
4. +3
1. +2
2. +6
3. +4
4. +3
Subtopic: d-Block Elements- Properties & Uses |
71%
Level 2: 60%+
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The calculated spin-only magnetic moments of \(\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{OH})_6\right] \text { and } \mathrm{K}_4\left[\mathrm{Fe}(\mathrm{OH})_6\right]\), respectively, are:
| 1. | 4.90 and 4.90 B.M | 2. | 5.92 and 4.90 B.M |
| 3. | 3.87 and 4.90 B.M | 4. | 4.90 and 5.92 B.M |
Subtopic: d-Block Elements- Properties & Uses |
85%
Level 1: 80%+
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Which of the following ions is the strongest oxidizing agent?
(Given: Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71]
(Given: Atomic Number of Ce = 58, Eu = 63, Tb = 65, Lu = 71]
| 1. | \(\mathrm{Lu}^{3+}\) | 2. | \(\mathrm{Eu}^{2+}\) |
| 3. | \(\mathrm{Tb}^{4+}\) | 4. | \(\mathrm{Ce}^{3+}\) |
Subtopic: f-Block Elements- Properties & Uses | Lanthanoid & Actinoids Contraction |
58%
Level 3: 35%-60%
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Match List-I with List-II.
Choose the correct answer from the options given below:
1. (A)-(IV), (B)-(II), (C)-(III), (D)-(I)
2. (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
3. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
4. (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
| List-I (Types of alloy) |
List-II (Composition) |
||
| (A) | Bronze | (I) | Cu, Ni |
| (B) | Brass | (II) | Fe, Cr, Ni, C |
| (C) | UK silver coin | (III) | Cu, Zn |
| (D) | Stainless Steel | (IV) | Cu, Sn |
Choose the correct answer from the options given below:
1. (A)-(IV), (B)-(II), (C)-(III), (D)-(I)
2. (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
3. (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
4. (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
Subtopic: d-Block Elements- Properties & Uses |
83%
Level 1: 80%+
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Which of the following oxidation reactions are carried out by both \(\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7\) and \(\mathrm{KMnO}_4\) in acidic medium?
A. \(\mathrm{I}^{-} \rightarrow \mathrm{I}_2\)
B. \(\mathrm{S}^{2-} \rightarrow \mathrm{S}\)
C. \(\mathrm{Fe}^{2+} \rightarrow \mathrm{Fe}^{3+}\)
D. \(\mathrm{I}^{-} \rightarrow \mathrm{IO}_3^{-}\)
E. \(\mathrm{S}_2 \mathrm{O}_3^{2-} \rightarrow \mathrm{SO}_4^{2-}\)
Choose the correct answer from the options given below:
1. B, C and D only
2. A, D and E only
3. A, B and C only
4. C, D and E only
A. \(\mathrm{I}^{-} \rightarrow \mathrm{I}_2\)
B. \(\mathrm{S}^{2-} \rightarrow \mathrm{S}\)
C. \(\mathrm{Fe}^{2+} \rightarrow \mathrm{Fe}^{3+}\)
D. \(\mathrm{I}^{-} \rightarrow \mathrm{IO}_3^{-}\)
E. \(\mathrm{S}_2 \mathrm{O}_3^{2-} \rightarrow \mathrm{SO}_4^{2-}\)
Choose the correct answer from the options given below:
1. B, C and D only
2. A, D and E only
3. A, B and C only
4. C, D and E only
Subtopic: Chemistry of Mn and Cr Compounds |
72%
Level 2: 60%+
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