Hydrogen peroxide can be preapared by the action of dil. `H_(2)SO_(4)` or `H_(3)PO_(4)` on barium peroxide or by bubbling peroxide . On an industrial scale, it can be prepared by hydrolysis of peroxodisulphuric acid obtained by electrolysis of 50% `H_(2)SO_(4)` or an equimolar mixture of `H_(2)SO_(4)` and ammonium sulphate . The strength of `H_(2)O_(2)` solution can be expressed in a number of ways namely normality , molarity , percentage strength and volume strength . Volume strength refers to the volume of `O_(2)` produced at N.T.P. by decomposition of 1 mL of `H_(2)O_(2)` solution. `H_(2)O_(2)` acts as an oxidising as well as reducing agent both in acidic and basic media.
Which of the following substances on treatment with `H_(2)O_(2)` gives `MnO_(2)`

Options

A. acidified `KMnO_(4)`
B. alkaline `KMnO_(4)`
C. alkaline `MnSO_(4)`
D. both (b) and (c)

Answer

To determine which substances, when treated with hydrogen peroxide (H₂O₂), yield manganese dioxide (MnO₂), we can analyze the reactions involving the given options.

### Step-by-Step Solution:

1. **Identify the Options**: The options provided are:
- A: Acidified KMnO₄
- B: Alkaline KMnO₄
- C: Alkaline MnSO₄
- D: Both B and C

2. **Reaction of Acidified KMnO₄ with H₂O₂**:
- When acidified KMnO₄ reacts with H₂O₂, the products are potassium sulfate (K₂SO₄), manganese sulfate (MnSO₄), water (H₂O), and oxygen (O₂).
- The balanced equation is:
\[ 2 \text{KMnO}_4 + 3 \text{H}_2\text{SO}_4 + 5 \text{H}_2\text{O}_2 \rightarrow \text{K}_2\text{SO}_4 + 2 \text{MnSO}_4 + 8 \text{H}_2\text{O} + 5 \text{O}_2 \]
- **Conclusion**: MnO₂ is not produced in this reaction. Thus, option A is incorrect.

3. **Reaction of Alkaline KMnO₄ with H₂O₂**:
- When alkaline KMnO₄ reacts with H₂O₂, manganese dioxide (MnO₂) is formed along with oxygen gas, potassium hydroxide (KOH), and water.
- The balanced equation is:
\[ 2 \text{KMnO}_4 + 3 \text{H}_2\text{O}_2 \rightarrow 2 \text{MnO}_2 + 3 \text{O}_2 + 2 \text{KOH} + 4 \text{H}_2\text{O} \]
- **Conclusion**: MnO₂ is produced in this reaction. Thus, option B is correct.

4. **Reaction of Alkaline MnSO₄ with H₂O₂**:
- When alkaline MnSO₄ reacts with H₂O₂, manganese dioxide (MnO₂) is also formed.
- The balanced equation is:
\[ 2 \text{KOH} + \text{MnSO}_4 + \text{H}_2\text{O}_2 \rightarrow \text{MnO}_2 + \text{K}_2\text{SO}_4 + 2 \text{H}_2\text{O} \]
- **Conclusion**: MnO₂ is produced in this reaction as well. Thus, option C is correct.

5. **Final Conclusion**:
- Since both options B and C lead to the formation of MnO₂, the correct answer is option D: Both B and C.