Hydrogen peroxide is reduced by

Options

A. Ozone
B. Barium peroxide
C. Acidic solution of `KMnO_(4)`
D. Lead sulphide suspension

Answer

To determine which substance reduces hydrogen peroxide, we will analyze each option provided in the question step by step.

### Step 1: Analyze Option 1 - Ozone
- **Reaction**: When hydrogen peroxide (H₂O₂) reacts with ozone (O₃), it produces water (H₂O) and oxygen (O₂).
- **Balanced Equation**:
\[ 2 H₂O₂ + O₃ \rightarrow 2 H₂O + 2 O₂ \]
- **Oxidation States**: In this reaction, ozone is reduced to oxygen (O₂), indicating that ozone loses oxygen. Therefore, hydrogen peroxide is oxidized, not reduced.
- **Conclusion**: This option is incorrect.

### Step 2: Analyze Option 2 - Barium Peroxide
- **Reaction**: Barium peroxide (BaO₂) is known to be a precursor for hydrogen peroxide and does not react with it.
- **Conclusion**: Since there is no reaction between barium peroxide and hydrogen peroxide, this option is also incorrect.

### Step 3: Analyze Option 3 - Acidic Solution of KMnO₄
- **Reaction**: When hydrogen peroxide reacts with an acidic solution of potassium permanganate (KMnO₄), it produces potassium sulfate (K₂SO₄), manganese sulfate (MnSO₄), water (H₂O), and oxygen (O₂).
- **Balanced Equation**:
\[ 5 H₂O₂ + 2 KMnO₄ + 3 H₂SO₄ \rightarrow K₂SO₄ + 2 MnSO₄ + 8 H₂O + 5 O₂ \]
- **Oxidation States**: The oxidation state of manganese changes from +7 in KMnO₄ to +2 in MnSO₄, indicating that KMnO₄ is reduced. Since reduction of KMnO₄ occurs, hydrogen peroxide is oxidized.
- **Conclusion**: This option is incorrect.

### Step 4: Analyze Option 4 - Lead Sulfide Suspension
- **Reaction**: When lead sulfide (PbS) reacts with hydrogen peroxide, it produces lead sulfate (PbSO₄) and water (H₂O).
- **Balanced Equation**:
\[ PbS + 4 H₂O₂ \rightarrow PbSO₄ + 4 H₂O \]
- **Oxidation States**: The oxidation state of sulfur changes from -2 in PbS to +6 in PbSO₄, indicating that sulfur is oxidized. Therefore, hydrogen peroxide is reduced in this reaction.
- **Conclusion**: This option is correct.

### Final Answer:
The correct answer is **Option 4: Lead Sulfide Suspension reduces hydrogen peroxide.**

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