Question on: JAMB Chemistry - 2024
When Sulphur(IV)oxide is passed into solution of acidified tetraoxomanganate(VII), the colour changes from
A
blue to green
B
pink to yellow
C
purple to colourless
D
Orange to green
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Correct Option: C
When sulfur(IV) oxide (SO₂) is passed into an acidified solution of tetraoxomanganate(VII) (permanganate, MnO₄⁻), a redox reaction occurs. The permanganate ion acts as an oxidizing agent and is reduced, while sulfur dioxide (SO₂) is oxidized. The characteristic purple color of the permanganate ion fades as it is reduced to colorless manganese(II) ions (Mn²⁺).
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