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On reaction of moist SO(2) with potassiu...

On reaction of moist `SO_(2)` with potassium permangnate (Acidic) which is correctly observed?

A

Colour of `KMnO_(4)` is decolourised

B

`SO_(2)` is oxidised to `SO_(3)`

C

`MnO_(4)^(-)` is reduced to `MnO_2`

D

All of these

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the reaction of moist \( SO_2 \) with potassium permanganate (\( KMnO_4 \)) in an acidic medium, we will break down the steps involved in the reaction and analyze the observations. ### Step-by-Step Solution: 1. **Identify the Reactants**: - The reactants are moist \( SO_2 \) and potassium permanganate (\( KMnO_4 \)) in an acidic solution. 2. **Write the Balanced Chemical Equation**: - The reaction can be represented as follows: \[ 2 KMnO_4 + 5 SO_2 + 2 H_2O \rightarrow 2 H_2SO_3 + 2 MnSO_4 + K_2SO_4 \] - This equation shows that \( KMnO_4 \) reacts with \( SO_2 \) and water to produce sulfurous acid (\( H_2SO_3 \)), manganese sulfate (\( MnSO_4 \)), and potassium sulfate (\( K_2SO_4 \)). 3. **Determine the Oxidation States**: - In \( KMnO_4 \), manganese is in the +7 oxidation state. - In \( H_2SO_3 \), sulfur is in the +4 oxidation state. - In \( K_2SO_4 \), sulfur is in the +6 oxidation state. - The manganese is reduced from +7 to +2 in \( MnSO_4 \). 4. **Identify the Observations**: - As \( SO_2 \) acts as a reducing agent, it will reduce \( KMnO_4 \), leading to the decolorization of the purple color of potassium permanganate. - The pink color of \( KMnO_4 \) disappears as it is reduced. 5. **Evaluate the Options**: - **Option A**: The color of \( KMnO_4 \) decolorizes - This is correct. - **Option B**: \( SO_2 \) is oxidized to \( SO_3 \) - This is incorrect; \( SO_2 \) is oxidized to \( K_2SO_4 \). - **Option C**: \( MnO_4^- \) is reduced to \( MnO_2 \) - This is incorrect; \( MnO_4^- \) is reduced to \( Mn^{2+} \). - **Option D**: All of the above - This is incorrect since only option A is correct. 6. **Conclusion**: - The correct observation when moist \( SO_2 \) reacts with potassium permanganate in an acidic medium is that the color of \( KMnO_4 \) decolorizes. ### Final Answer: The color of \( KMnO_4 \) decolorizes.
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