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Q. No.Consider the following reaction:
S₈(s) + 12NaOH(aq) → 4Na₂S(aq) + 2Na₂S₂O₃(aq) + 6H₂O(l)
Here:
A = S₈(s)
B = Na₂S(aq)
C = Na₂S₂O₃(aq)
The oxidation states of sulfur in the given equation is A, B, and C are respectively:
1. 0, -2, +2
2. -2, 0, -2
3. 0, +2, -2
4. -2, -2, +2
B = Na₂S(aq)
C = Na₂S₂O₃(aq)
Subtopic: Introduction to Redox and Oxidation Number |
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What is the change in the oxidation state of Hg in the following reaction?
2HgCl2(aq.) + SnCl2(aq.) → Hg2Cl2(s) + SnCl4(aq.)
1. +2 to 0
2. +2 to +1
3. +1 to +2
4. +4 to +2
2HgCl2(aq.) + SnCl2(aq.) → Hg2Cl2(s) + SnCl4(aq.)
1. +2 to 0
2. +2 to +1
3. +1 to +2
4. +4 to +2
Subtopic: Redox Titration & Type of Redox |
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Subtopic: Introduction to Redox and Oxidation Number |
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Among the following compounds, an element that exhibits two oxidation states in the same compound is:
1. NH2OH
2. NH4NO3
3. N2H4
4. N3H
1. NH2OH
2. NH4NO3
3. N2H4
4. N3H
Subtopic: Introduction to Redox and Oxidation Number |
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Which pair of species has vanadium in the same oxidation state?
1. \(\text{VO}_2~\text{and}~\text{VO}_3^-\)
2. \(\text{VO}_2~\text{and}~\text{V}_2\text{O}_5\)
3. \(\text{VCl}_4 ~\text{and}~\text{VO}^{2+}\)
4. \(\text{VCl}_4 ~\text{and}~ \text{VO}_3^- \)
1. \(\text{VO}_2~\text{and}~\text{VO}_3^-\)
2. \(\text{VO}_2~\text{and}~\text{V}_2\text{O}_5\)
3. \(\text{VCl}_4 ~\text{and}~\text{VO}^{2+}\)
4. \(\text{VCl}_4 ~\text{and}~ \text{VO}_3^- \)
Subtopic: Introduction to Redox and Oxidation Number |
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Given below are two statements:
| Statement I: | Displacement redox reactions can be classified into metal displacement and non-metal displacement. |
| Statement II: | The non-metal displacement redox reactions include hydrogen displacement but rarely oxygen displacement. |
| 1. | Both Statement I and Statement II are correct. |
| 2. | Both Statement I and Statement II are incorrect. |
| 3. | Statement I is correct and Statement II is incorrect. |
| 4. | Statement I is incorrect and Statement II is correct. |
Subtopic: Redox Titration & Type of Redox |
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Level 2: 60%+
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Given below are two statements:
| Assertion (A): | HClO4 is a stronger acid than HClO3. |
| Reason (R): | The oxidation state of Cl in HClO4 is +8 and in HClO3 is +5. |
| 1. | Both (A) and (R) are True, and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True, and (R) is not the correct explanation of (A). |
| 3. | (A) is True, but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Introduction to Redox and Oxidation Number |
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Given below are two statements:
| Statement I: | In some cases, oxygen shows a positive oxidation number, though it is an electronegative element. |
| Statement II: | Fluorine is more electronegative than oxygen. |
| 1. | Statement I is false but Statement II is true. |
| 2. | Both Statement I and Statement II are true. |
| 3. | Both Statement I and Statement II are false. |
| 4. | Statement I is true but Statement II is false. |
Subtopic: Introduction to Redox and Oxidation Number |
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Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
In light of the above statements, choose the correct answer from the options given below:
| Assertion (A): | HNO3 acts as an oxidizing agent. |
| Reason (R): |
The oxidation state of nitrogen in HNO₃ is +5, which cannot increase further. Thus, the oxidation state of nitrogen in HNO₃ can only decrease. |
| 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. | Both (A) and (R) are False. |
Subtopic: Introduction to Redox and Oxidation Number | Oxidizing & Reducing Agents |
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Which of the following represents an oxidation half-reaction, for the given redox reaction?
\(3MnO_2 \,+\,2Al\) → \(2Al_2O_3 \,+\,3Mn\),
1. Mn4+ + 4e− → Mn
2. Mn2+ + 2e− → Mn
3. Al → Al3+ + 3e−
4. Al3+ + 3e− → Al
\(3MnO_2 \,+\,2Al\) → \(2Al_2O_3 \,+\,3Mn\),
1. Mn4+ + 4e− → Mn
2. Mn2+ + 2e− → Mn
3. Al → Al3+ + 3e−
4. Al3+ + 3e− → Al
Subtopic: Redox Titration & Type of Redox |
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