Question

Bleaching by SO2 is _____ reaction​

Answer 1

Answer : Bleaching action of SO2 is due to reduction and it is temporary.

Explaination : sulphur dioxide and chlorine are used as bleaching agents. However Bleaching action of chlorine is based on oxidation while that of sulphur is based on reduction.

Sulphour dioxide is used as bleaching agent as it removes oxygen from the coloured substances and makes it colorless (Bleaching action). But atmospheric oxygen slowly occupies removed oxygen and the material regains the color.

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Answer 2

Answer:

Bleaching by $SO_2$ is a reduction reaction

Explanation:

As a transient bleaching agent sulfur dioxide is utilized.

• When exposed to $SO_2$ , pigment loses its color and becomes a colorless substance.

• When exposed to air, the colorless reduced product reoxidizes and returns to its former color.

• Sulfur's bleaching impact is dependent on a reduction in the amount of oxygen in the air.

                             $SO_2 +2H_2O$  →  $H_2SO_4 +2[H](nascent)$

             Color material +[H]  → Colorless color (in presence of air)

• It is commonly used to bleach delegated materials such as ivory, silk, and wool.
• On the other hand, the bleaching action of Chlorine is permanent due to the  oxidation reaction