Q. In India, sugar is refined using the double sulphitation method, which refers to the practice of adding Sulphur Dioxide (SO₂) or derivatives in manufacturing of sugar. Why is Sulphur Dioxide added in sugar manufacturing?
Answer: as a bleaching agent and for purification of sugarcane juice giving white color to sugar
Notes: SO₂ is added in sugar manufacturing process because at initial stage it converts the basic character of treated sugar cane juice to neutral in character. During second time treatment of juice with SO₂, it is used as a bleaching agent and leads to purification and responsible for white colour of sugar. The added sulphur leads to formation of hydrogen sulphides (H2S) which is a poisonous gas and is responsible for producing foul smell in industry.

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