Question

Moist SO2 decolourises Kmno4 solution why

Answer 1

Moist SO2 decolourises Kmno4 solution:

(a) Moist sulphur dioxide behaves as a reducing agent, reduces MnO4- to Mn2+ .

(b) X – X’ bond in interhalogens is weaker than X - X bond in halogensexcept F-

(c) It converts iron(III) ions to iron(II) ions and decolourises acidified potassium permanganate(VII) solution

5SO2 + 2MnO4- + 2H2O → 5SO42- + 4H+ + 2Mn2+

Answer 2

Moist SO2 decolourises Kmno4 solution  due to the reduction of Mn tp Mn2+.

Explanation:

• Reductions meas to gain electrons.
• Oxidation means to lose electrons.

• Moist sulphur dioxide behaves as a reducing agent.
• It reduces MnO4- to Mn2+.
• Therefore the color of KMnO4 changes.
• It changes from purple to pink due to the reduction of Mn to Mn2+.

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What is oxidation and reduction reaction with explanation and suitable examples  ?

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