Which role does SO₂ play when an aqueous solution of SO₂ reacts with H₂S to precipitate sulfur?

1. Catalyst

2. Reducing agent

3. Oxidising agent

4. Acid

In the reaction;

2Ag + 2H₂SO₄ $\to$Ag₂SO₄ + 2H₂O + SO_2.
What role does H₂SO₄ play?

1. Oxidizing agent

2. Reducing agent

3. Dehydrating agent

4. None of the above

Find the values of X and Y in the balanced reaction:

X HI + Y HNO₃ $\to$NO + I₂ + H₂O

1. X=3, Y=2

2. X=2, Y=3

3. X=6, Y=2

4. X=6, Y=1

Which of the following is not an intramolecular redox reaction?

1. NH₄NO₂ $\to$N₂ + 2H₂O

2. 2Mn₂O₇ $\to$4MnO₂ + 3O₂

3. 2KClO₃ $\to$2KCl + 3O₂

4. $2{\mathrm{H}}_2{\mathrm{O}}_2$ $\to$2H₂O + O₂

Find the values of X and Y using the principle of redox balancing in an alkaline medium.

C₂H₅OH + X I₂ + Y OH^- $\to$CHI₃ + HCO₂^- + 5I^- + 5H₂O

1. 4,6

2. 2,6

3. 2,4

4. 4,4

Which one is correct about CH₂ = CCl₂?

1. Both carbons are in +2 oxidation state.

2. Both carbons are in +1 oxidation state.

3. One carbon has +2 and other -2 oxidation states.

4. The average oxidation number of carbon is +1.

In the given reaction,

xBrO₃^-+ yCr⁺³ + zH₂O $\to$Br₂ + CrO₄^2- + H⁺

The coefficients x, y, and z are respectively-

1. 6, 10, 11

2. 6, 10, 20

3. 6, 8, 22

4. 6, 10, 22

Identify the substance acting as an oxidant in the following reaction:

BaCl₂ + Na₂SO₄$\to$BaSO₄ + 2NaCl

1. BaCl₂

2. Na₂SO₄

3. NaCl

4. None of the above

The number of moles of ferrous oxalate oxidised by one mole of KMnO₄ is

(1) $\frac{5}{2}$

(2) $\frac{2}{5}$

(3) $\frac{3}{5}$

(4) $\frac{5}{3}$

Which of the following represents the correctly balanced equation in redox reaction?

1. 5BiO₃^-+ 22H⁺ + 2${\mathrm{Mn}}^{2+}$ → 5Bi³⁺ + 7H₂O + 2MnO₄^–

2. 5BiO₃^- + 14H⁺ + 2${\mathrm{Mn}}^{2+}$ → 5Bi³⁺ + 7H₂O + 2MnO₄^–

3. 2BiO₃^- + 4H⁺ + 2Mn²⁺ → 6Bi³⁺ + 2H₂O + MnO₄^–

4. 6BiO₃^-+ 12H⁺ + 2Mn²⁺ → 6Bi³⁺ + 6H₂O + 2MnO₄^–