Q. No.| 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. |
Find the process in which the oxidation state changes by five units.
1. MnO₄⁻ → Mn²⁺2. CrO₄²⁻ → Cr³⁺
3. C₂O₄²⁻ → 2CO₂
4. Cr₂O₇²⁻ → 2Cr³⁺
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
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| 1. | Electrolysis and reduction | 2. | Redox and oxidation |
| 3. | Reduction and oxidation | 4. | Oxidation and electrolysis |
\(2 \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{I}_2 \rightarrow \mathrm{S}_4 \mathrm{O}_6^{2-}+2 \mathrm{I}^{-} \)
(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
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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 |
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. |
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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
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