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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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