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Q. No.| Assertion (A): | In the presentation \( \mathrm{E}_{\mathrm{Fe}^{3+}}^{\ominus} /_{ \mathrm{Fe}^{2+}}\) \( \text { and } \mathrm{E}_{\mathrm{Cu}^{2+}}^{\ominus} / _{\mathrm{Cu}^{\prime}} \mathrm{Fe}^{3+} / \mathrm{Fe}^{2+} \) and\(\text { } \mathrm{Cu}^{2+} / \mathrm{Cu}\) are reodox couples. |
| Reason (R): | A redox couple is the combination of the oxidised and reduced forms of a substance involved in an oxidation or reduction half cell. |
| 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: Introduction to Redox and Oxidation Number |
74%
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Given below are two statements:
| Assertion (A): | The decomposition of hydrogen peroxide to form water and oxygen is an example of a disproportionation reaction. |
| Reason (R): | The oxygen of peroxide is in –1 oxidation state and it is converted to zero oxidation state in O2 and –2 oxidation state in H2O. |
| 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: Redox Titration & Type of Redox |
90%
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Match the items in Column I with relevant items in Column II.
|
Column I |
Column II |
||
| A. |
Ions having a positive charge |
1. |
+7 |
| B. |
The sum of oxidation number of all atoms in a neutral molecule |
2. |
–1 |
| C. |
Oxidation number of hydrogen ion. (H+) |
3. |
+1 |
| D. |
Oxidation number of fluorine in NaF |
4. |
0 |
| E. |
Ions having a negative charge |
5. |
Cation |
| 6. |
Anion |
Codes:
| Options: | A | B | C | D | E |
| 1. | 5 | 4 | 3 | 2 | 6 |
| 2. | 1 | 2 | 3 | 5 | 4 |
| 3. | 5 | 4 | 3 | 2 | 1 |
| 4. | 4 | 5 | 3 | 2 | 1 |
Subtopic: Introduction to Redox and Oxidation Number |
93%
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Given below are two statements:
| Assertion (A): | Among halogens, fluorine is the best oxidant. |
| Reason (R): | Fluorine is the most electronegative atom. |
| 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: Emf & Electrode Potential |
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Given below are two statements:
| Assertion (A): | In the reaction between potassium permanganate and potassium iodide, permanganate ions act as an oxidising agent. |
| Reason (R): | The oxidation state of manganese changes from +2 to +7 during the reaction. |
| 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: Redox Titration & Type of Redox |
68%
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Which of the following statements are not true about the following decomposition reaction?
| a. | Potassium is undergoing oxidation |
| b. | Chlorine is undergoing oxidation |
| c. | Oxygen is reduced |
| d. | None of the species are undergoing either oxidation or reduction |
The correct choice from the above is:
1. a, b and d
2. b, c and d
3. b, d and a
4. None of the above
Subtopic: Introduction to Redox and Oxidation Number | Oxidizing & Reducing Agents |
67%
From NCERT
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Which of the following statement(s) is/are correct regarding the given reaction?
(a) Zinc is acting as an oxidant
(b) Chlorine is acting as a reductant
(c) Hydrogen ion is acting as an oxidant
(d) Zinc is acting as a reductant
Options:
1. (a) & (b)
2. (b) & (c)
3. (c) & (d)
4. (a) & (d)
Subtopic: Oxidizing & Reducing Agents |
78%
From NCERT
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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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For the reaction:
H2S (g) + Cl2 (g) → 2 HCl (g) + S (s)
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 |
82%
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Match the items in Column-I with Column-II.
(O.S = oxidation state)
| Column-I | Column-II (Oxidation State) |
||
| a. | O.S of Au in HAuCl4 | i. | +2 |
| b. | O.S of Tl in Tl2O | ii. | +1 |
| c. | O.S of Fe in FeO | iii. | +3 |
| d. | O.S of Cu in CuI |
1. a=i; b=ii; c=iii; d=ii
2. a=iii; b=i; c=ii; d=ii
3. a=iii; b=ii; c=i; d=ii
4. a=ii; b=i; c=iii; d=ii
Subtopic: Introduction to Redox and Oxidation Number |
87%
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