Question
When an article is bleached by $\mathrm{SO}_{2}$ it loses its colour. The colour can be restored by(a) Heating(b) Exposure to air(c) Dilution(d) None of these
Step 1
This process is called reduction. (a) Heating: Heating the article might cause some chemical reactions to occur, but it is not guaranteed to restore the color. In some cases, it might even cause further degradation of the colored compounds. (b) Exposure to air: Show more…
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