Chemistry 0620 · IGCSE · Identification of ions and gases

Identification of ions and gases — practice question

Sulfur dioxide is tested by reacting it with acidified potassium manganate(VII). What colour change is observed in this test?

  • Ablue to white
  • Bcolourless to purple
  • Cpurple to colourless
  • Dwhite to blue

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