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\( S O_{2} \) and \( C l_{2} \) both are used as bleaching agent. Factors that cause bleaching are respectively:

1. \( H \) (that causes reduction), \( O \) (that causes oxidation)
2. \( O \) (that causes reduction), \( H \) (that causes oxidation)
3. \( H \) (that causes oxidation), \( O \) (that causes reduction)
4. \( O \) (that causes oxidation), \( H \) (that causes reduction)

Correct answer: \( O \) (that causes oxidation), \( H \) (that causes reduction)

Solution

Chlorine bleaches by oxidation: in water it forms oxidizing species that destroy color. Sulfur dioxide bleaches by reduction: it reduces colored substances to colorless forms, so the factors are O for oxidation and H for reduction.

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