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Q. No.(a) H2O2 + O3 → H2O + 2O2
(b) H2O2 + Ag2O → 2Ag + H2O + O2
The role of hydrogen peroxide in the above reactions is respectively:
| 1. | Oxidizing in (a) and reducing in (b) |
| 2. | Reducing in (a) and oxidizing in (b) |
| 3. | Reducing in (a) and (b) |
| 4. | Oxidizing in (a) and (b) |
Subtopic: Oxidizing & Reducing Agents |
52%
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Which species acts as an oxidant in the following reaction?
\(2Cu_2O(s) + Cu_2S(s) \rightarrow 6Cu(s) + SO_2(g) \)
1. O(-II)
2. S(-II)
3. Cu(I)
4. Cu(0)
\(2Cu_2O(s) + Cu_2S(s) \rightarrow 6Cu(s) + SO_2(g) \)
1. O(-II)
2. S(-II)
3. Cu(I)
4. Cu(0)
Subtopic: Oxidizing & Reducing Agents |
77%
From NCERT
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Given below are two statements:
| Assertion (A): | In the following chemical reaction between \(H_2S(g)\) and \(Cl_2(g)\), \(H_2S(g)\) is oxidized to \(S(s)\) \(H_2S(g) +Cl_2(g) \rightarrow 2HCl(g) +S(s) \) |
| Reason (R): | Electropositive element, hydrogen has been removed from S. |
| 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: Redox Titration & Type of Redox |
82%
From NCERT
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For the reaction:
Fe3O4 (s) + Al (s) → Fe (s) + Al2O3 (s)
The correct statement(s) in the equation is(are):
| a. | Stoichiometric coefficient of Fe is 9. |
| b. | Aluminium is oxidized |
| c. | Ferrous ferric oxide (Fe3O4) is oxidize |
| d. | Aluminium is reduced. |
1. a, c
2. a, b
3. b, c
4. c, d
Subtopic: Oxidizing & Reducing Agents |
85%
From NCERT
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For the following reaction,
2Na(s) + H2(g) → 2NaH(s)
The correct statement(s) in the balanced equation is(are):
a. Na is oxidized
b. H2 is oxidized
c. H2 is reduced
d. It is a disproportionation reaction
1. a, b
2. b, c
3. c, a
4. a, d
2Na(s) + H2(g) → 2NaH(s)
The correct statement(s) in the balanced equation is(are):
a. Na is oxidized
b. H2 is oxidized
c. H2 is reduced
d. It is a disproportionation reaction
1. a, b
2. b, c
3. c, a
4. a, d
Subtopic: Oxidizing & Reducing Agents |
78%
From NCERT
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For the reaction:
H2S (g) + Cl2 (g) → 2 HCl (g) + S (s)
The correct statement(s) in the balanced equation is(are):
a. H2S is oxidised
b. Cl2 is reduced
c. H2S is reduced
d. Cl2 is oxidised
1. a, b
2. b, c
3. c, d
4. a, d
Subtopic: Oxidizing & Reducing Agents |
81%
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Identify the correct statements regarding the given reaction:
| a. | Phosphorus undergoes reduction only. |
| b. | Phosphorus undergoes oxidation only. |
| c. | Phosphorus undergoes oxidation as well as reduction. |
| d. | Hydrogen undergoes neither oxidation nor reduction. |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Subtopic: Oxidizing & Reducing Agents | Redox Titration & Type of Redox |
87%
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Subtopic: Oxidizing & Reducing Agents |
63%
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Which change represents an oxidation?
1. \(\mathrm{NO}_2^{-} \rightarrow \mathrm{N}_2 \)
2. \(\mathrm{VO}^{2+} \rightarrow \mathrm{VO}_3^{-} \)
3. \(\mathrm{ClO}^{-} \rightarrow \mathrm{Cl}^{-} \)
4. \(\mathrm{CrO}_4{ }^{2-} \rightarrow \mathrm{Cr}_2 \mathrm{O}_7{ }^{2-}\)
1. \(\mathrm{NO}_2^{-} \rightarrow \mathrm{N}_2 \)
2. \(\mathrm{VO}^{2+} \rightarrow \mathrm{VO}_3^{-} \)
3. \(\mathrm{ClO}^{-} \rightarrow \mathrm{Cl}^{-} \)
4. \(\mathrm{CrO}_4{ }^{2-} \rightarrow \mathrm{Cr}_2 \mathrm{O}_7{ }^{2-}\)
Subtopic: Redox Titration & Type of Redox |
85%
From NCERT
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Give the following redox reaction:
\(3MnO_2 \,+\,2Al\) → \(2Al_2O_3 \,+\,3Mn\),
Which of the following represents an oxidation half-reaction?
1. Mn4+ + 4e− → Mn
2. Mn2+ + 2e− → Mn
3. Al → Al3+ + 3e−
4. Al3+ + 3e− → Al
\(3MnO_2 \,+\,2Al\) → \(2Al_2O_3 \,+\,3Mn\),
Which of the following represents an oxidation half-reaction?
1. Mn4+ + 4e− → Mn
2. Mn2+ + 2e− → Mn
3. Al → Al3+ + 3e−
4. Al3+ + 3e− → Al
Subtopic: Redox Titration & Type of Redox |
84%
From NCERT
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