Essential Chemistry for IGCSE - Making And Identifying Salts (Section 4 - No. 3)
What observation is made when sulfur dioxide gas is bubbled through acidified potassium manganate(VII) solution?
The solution turns from purple to colorless.
The solution turns from colorless to purple.
The solution produces a white precipitate.
The solution becomes hot.
Explanation
Sulfur dioxide reduces the acidified potassium manganate(VII) solution, causing the purple color to disappear (become colorless).
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