Multiple choice general knowledge science & technology

Name a bleaching agent

  1. Sulfuric acid

  2. Sulfur

  3. Hydrogen sulfide

  4. Sulfur di oxide
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D Correct answer
Explanation

Sulfur dioxide (SO2) acts as a bleaching agent through reduction - it removes color by breaking down conjugated double bonds in colored compounds. Sulfuric acid is not a bleaching agent, and hydrogen sulfide is primarily a reducing agent used in different contexts.

AI explanation

Sulfur dioxide (SO2) is commonly used as a bleaching agent because it can reduce colored organic compounds to colorless forms, a property exploited in bleaching wool, silk, and other delicate materials that would be damaged by stronger oxidizing bleaches like chlorine. This reducing bleaching action is temporary in some cases, as the color can slowly return upon oxidation by air.

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