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      Question

      Potassium metabisulhpite is used as a stable source

      of
      A Sulphur dioxide Correct Answer Incorrect Answer
      B Carbon dioxide Correct Answer Incorrect Answer
      C Sodium benzoate Correct Answer Incorrect Answer
      D Sulphate Correct Answer Incorrect Answer
      E None of the above Correct Answer Incorrect Answer

      Solution

      Potassium metabisulphite is a common wine or must additive, in which it forms sulfur dioxide (SO2). It decomposes at 190 °C, yielding potassium sulfite and sulfur dioxide:

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