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InterviewSolution
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Why bleaching action of sulphur dioxide is temporary? |
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Answer» Solution :In presence of water, sulphur dioxide bleaches coloured wool, silk, sponges and staw into colourless due to its reducing property. `SO_(2)+2H_(2)RARR 2H_(2)SO_(4)+2(H)` `underset("(Coloured)")(X)+2(H)rarr underset("Coloulress")(XH_(2))` However, the bleached product (colourless) is allowed to stand in AIR, it is reoxidised by atmopheric oxygen to its ORIGINAL COLOUR. Hence bleaching action of sulphur dioxide is temporary. |
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