A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?

Chemistry JAMB 1993

A gas that will turn orange potassium heptaoxodichromate (lV) solution to clear green is?

  • sulphur (ii) oxide checkmark
  • hydrogen sulphide
  • sulphide (lV) oxide
  • hydrogen chloride

The correct answer is: A

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