To solve the question of how hydrogen peroxide (H₂O₂) is obtained, we can analyze the given options based on chemical reactions involving the compounds mentioned.
### Step-by-Step Solution:
1. **Identify the Compounds**: The question provides several compounds, including BaO₂ (barium peroxide), MnO₂ (manganese dioxide), SeO₂ (selenium dioxide), and TeO₂ (tellurium dioxide). We need to determine which of these can produce H₂O₂ when reacted with sulfuric acid (H₂SO₄).
2. **Reaction of BaO₂ with H₂SO₄**:
- When barium peroxide (BaO₂) reacts with sulfuric acid, the reaction can be represented as:
\[
\text{BaO}_2 + \text{H}_2\text{SO}_4 + 8\text{H}_2\text{O} \rightarrow \text{BaSO}_4 + \text{H}_2\text{O}_2 + 8\text{H}_2\text{O}
\]
- This reaction produces barium sulfate (BaSO₄), water (H₂O), and hydrogen peroxide (H₂O₂). Therefore, BaO₂ is a valid source of H₂O₂.
3. **Reaction of MnO₂ with H₂SO₄**:
- The reaction of manganese dioxide (MnO₂) with sulfuric acid can be represented as:
\[
\text{MnO}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{MnSO}_4 + \text{H}_2\text{O} + \text{O}_2
\]
- In this case, the products are manganese sulfate (MnSO₄), water (H₂O), and oxygen (O₂). There is no formation of H₂O₂, making this option incorrect.
4. **Reaction of SeO₂ with H₂SO₄**:
- The reaction of selenium dioxide (SeO₂) with sulfuric acid can be represented as:
\[
\text{SeO}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{SeSO}_4 + \text{H}_2\text{O} + \text{O}_2
\]
- Similar to MnO₂, this reaction produces selenium sulfate (SeSO₄), water (H₂O), and oxygen (O₂), with no formation of H₂O₂.
5. **Reaction of TeO₂ with H₂SO₄**:
- The reaction of tellurium dioxide (TeO₂) with sulfuric acid can be represented as:
\[
\text{TeO}_2 + \text{H}_2\text{SO}_4 \rightarrow \text{TeSO}_4 + \text{H}_2\text{O} + \text{O}_2
\]
- This reaction also produces tellurium sulfate (TeSO₄), water (H₂O), and oxygen (O₂), with no formation of H₂O₂.
6. **Conclusion**: Based on the analysis, the only compound that produces hydrogen peroxide (H₂O₂) when reacted with sulfuric acid is barium peroxide (BaO₂). Therefore, the correct answer is:
- **H₂O₂ is obtained from BaO₂.**
