Question

Which gas is used to bleach delicate materials?

Answer 1

1. The removal of color from the fabric or clothes is bleaching.
2. Sulphur dioxide($\mathit{S}{\mathit{O}}_{\mathbf{2}}$) is used as a bleach since it can remove Oxygen (${\mathit{O}}_{\mathbf{2}}$) from the substance.
3. And it will then make the fabric colorless but the Oxygen present in the atmosphere, can again slowly accept Oxygen and make it colored.
4. So Sulfur dioxide gas is used as a bleach.