Discussion
The most commonly used bleaching agent is
Answer: C
Chlorine is the most commonly used bleaching agent.
In water it forms hypochlorous acid, \[\mathrm{Cl_2 + H_2O \rightarrow HCl + HOCl}\] which releases nascent oxygen and oxidises the coloured compound to a colourless one. Bleaching by chlorine is therefore permanent, unlike bleaching by sulphur dioxide, which works by reduction and reverses in air.
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