Essential Chemistry for IGCSE - Making And Identifying Salts (Section 4 - No. 1)
Which of the following is the best way to identify whether a gas is sulfur dioxide?
Inserting a burning splint to the test tube
Smelling the gas
Bubbling the gas through limewater
Passing the gas through acidified potassium manganate(VII)
Explanation
Sulfur dioxide decolorizes acidified potassium manganate(VII) solution.
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