How to distinguish between so2 and cl2
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SO2 -sulphur dioxide.
Sulphour dioxide removes oxygen from the coloured substance and makes it colourless. But atmospheric oxygen slowly takes place of the removed oxygen and because of which the material regains the colour.
CL2- chlorine.
Chlorine acts with water to produce nascent oxygen. This oxygen combines with coloured substance and makes it colourless.
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