When Sulphur(IV)oxide is passed into solution of acidified tetraoxomanganate(VII), the colour changes from

Assessment: JAMB UTME - Chemistry - 2024 Subject: Chemistry

Question 1 Report

When Sulphur(IV)oxide is passed into solution of acidified tetraoxomanganate(VII), the colour changes from 
Answer Details

When Sulphur(IV) oxide (SO2) is passed into a solution of acidified tetraoxomanganate (VII) (KMnO4), it acts as a reducing agent. This reaction involves the reduction of potassium permanganate (KMnO4), which is characterized by a distinctive color change.


The tetraoxomanganate (VII) ion (MnO4-) is purple in color. During the reaction, SO2 gets oxidized while the MnO4- ion is reduced to Mn2+, which is almost colorless or pale pink, depending on the concentration.


Thus, the color of the solution changes from purple to almost colorless as the reaction progresses.

Read lesson note on Redox Reactions (WAEC)
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