Q. No.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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Find the process in which the oxidation state changes by five units.
1. MnO₄⁻ → Mn²⁺2. CrO₄²⁻ → Cr³⁺
3. C₂O₄²⁻ → 2CO₂
4. Cr₂O₇²⁻ → 2Cr³⁺
Subtopic: Oxidizing & Reducing Agents |
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Level 1: 80%+
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Oxidation numbers of P in , of S in and that of Cr in are respectively:
1. +5, +6 and +6
2. +3, +6 and +5
3. +5, +3 and +6
4. -3, +6 and +6
Subtopic: Oxidizing & Reducing Agents |
91%
Level 1: 80%+
AIPMT - 2009
Hints
The gain and loss of electrons, respectively, is called as:
| 1. | Electrolysis and reduction | 2. | Redox and oxidation |
| 3. | Reduction and oxidation | 4. | Oxidation and electrolysis |
Subtopic: Oxidizing & Reducing Agents |
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Consider the following redox reaction and select the correct statements from (a), (b), (c) and (d):
\(2 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{I}_2 \rightarrow \mathrm{S}_4 \mathrm{O}_6^{2-}+2 \mathrm{I}^{-} \)
(a) \(\mathrm{S}_2 \mathrm{O}_3^{2-}\) gets reduced to \(\mathrm{S}_4 \mathrm{O}_6^{2-}\).
(b) \(\mathrm{S}_2 \mathrm{O}_3^{2-}\) gets oxidized to \(\mathrm{S}_4 \mathrm{O}_6^{2-}\).
(c) \(\mathrm{I}_2\) gets reduced to \(\mathrm{I}^{-}\).
(d) \(\mathrm{I}_2\) gets oxidized to \(\mathrm{I}^{-}\).
1. a, b, c
2. b, c
3. a, b, d
4. None of the above
\(2 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{I}_2 \rightarrow \mathrm{S}_4 \mathrm{O}_6^{2-}+2 \mathrm{I}^{-} \)
(a) \(\mathrm{S}_2 \mathrm{O}_3^{2-}\) gets reduced to \(\mathrm{S}_4 \mathrm{O}_6^{2-}\).
(b) \(\mathrm{S}_2 \mathrm{O}_3^{2-}\) gets oxidized to \(\mathrm{S}_4 \mathrm{O}_6^{2-}\).
(c) \(\mathrm{I}_2\) gets reduced to \(\mathrm{I}^{-}\).
(d) \(\mathrm{I}_2\) gets oxidized to \(\mathrm{I}^{-}\).
1. a, b, c
2. b, c
3. a, b, d
4. None of the above
Subtopic: Oxidizing & Reducing Agents | Balancing of Equations |
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Subtopic: Oxidizing & Reducing Agents |
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Level 1: 80%+
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Find the element that is being reduced in the following redox reaction:
3Cu(s) + 8HNO₃(aq) → 2NO(g) + 3Cu(NO₃)₂(aq) + 4H₂O(l)
| 1. | Cu | 2. | H |
| 3. | N | 4. | O |
Subtopic: Oxidizing & Reducing Agents |
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Which of the following compounds contains iron (Fe) in the zero oxidation state?
| 1. | [Fe(CN)6]-4 | 2. | [Fe(CN)6]-3 |
| 3. | Fe(CO)5 | 4. | All of the above. |
Subtopic: Oxidizing & Reducing Agents |
86%
Level 1: 80%+
AIPMT - 1999
Hints
For the reaction:
Fe3O4 (s) + Al (s) → Fe (s) + Al2O3 (s)
Which of the following statements about the reaction are correct?
| a. | Stoichiometric coefficient of Fe is 9. |
| b. | Aluminium is oxidized. |
| c. | Ferrous ferric oxide (Fe3O4) is oxidized. |
| d. | Aluminium is reduced. |
1. a, c
2. a, b
3. b, c
4. c, d
Subtopic: Oxidizing & Reducing Agents |
84%
Level 1: 80%+
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Subtopic: Oxidizing & Reducing Agents |
83%
Level 1: 80%+
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