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) |
\(2Cu_2O(s) + Cu_2S(s) \rightarrow 6Cu(s) + SO_2(g) \)
1. O(-II)
2. S(-II)
3. Cu(I)
4. Cu(0)
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
2Na(s) + H2(g) → 2NaH(s)
The correct statements in the balanced equation are:
a. Na is oxidized
b. H2 is oxidized
c. H2 is reduced
d. It is a disproportionation reaction
Choose the correct option:
| 1. | a and b | 2. | b and c |
| 3. | a and c | 4. | a and d |
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
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)
Which of the following cannot act as an oxidizing agent?
| 1. | \(S^{2-}\) | 2. | \(B r_2\) |
| 3. | \(\mathrm{HSO}_4^{-}\) | 4. | \(\mathrm{SO}_3^{2-}\) |
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. a, c and d
4. None of the above
What is the alteration in the oxidation state of carbon in the given reaction?
\(\mathrm{{CH_4}_{(g)} + 4{Cl_2}_{(g)} \rightarrow {CCl_4}_{(l)} + 4 HCl_{(g)}}\)
| 1. | 0 to +4 | 2. | –4 to +4 |
| 3. | 0 to –4 | 4. | +4 to +4 |
Which of the following statement regarding the rules to calculate the oxidation number is incorrect?
| 1. | The oxidation number of hydrogen is always +1. |
| 2. | The algebraic sum of all the oxidation numbers carried by elements in a compound is zero. |
| 3. | An element in its free or uncombined state has an oxidation number of zero. |
| 4. | Generally, in all its compounds, the oxidation number of fluorine is -1. |
© 2026 GoodEd Technologies Pvt. Ltd.