Question

In the reaction between moist SO₂ and acidified permanganate solution :

• A. SO₂ is oxidised to SO₄^2-
  MnO₄^- is reduced to MnO²⁺
• B. SO₂ is reduced to S
  MnO₄^- is oxidised to MnO₄
• C. SO₂ is oxidised to SO₃^2-
  MnO₄^- is reduced to MnO₂
• D. SO₂ is reduced to H₂S
  MnO₄^- is oxidised to MnO₄

Answer 1

The Correct Option is A

• When sulfur dioxide (SO₂) reacts with acidified permanganate solution (KMnO₄), the sulfur dioxide is oxidized to sulfate ions (SO₄²⁻), and the permanganate ion (MnO₄⁻) is reduced to Mn²⁺ (manganese in its +2 oxidation state).
• This is a redox reaction, where SO₂ acts as the reducing agent (loses electrons) and MnO₄⁻ acts as the oxidizing agent (gains electrons).

Thus, the correct option is (A).

Answer 2

When sulfur dioxide (SO₂) reacts with acidified potassium permanganate (KMnO₄), SO₂ is oxidised to sulfate ions (SO₄²⁻), and permanganate ions are reduced to manganese (Mn²⁺). The overall reaction is a redox reaction in which the oxidation state of sulfur increases.