Essential Chemistry for IGCSE - Making And Identifying Salts (Section 3 - No. 28)
What is the observation when sulfur dioxide is present?
Forms a milky precipitate.
Turns blue litmus paper red.
Turns acidified potassium manganate(VII) colorless.
Burns with a pop sound.
Explanation
Sulfur dioxide turns the acidified potassium manganate(VII) colorless.
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