The most commonly used bleaching agent is_________?
Correct answer: C. chlorine
- A. alcohol
- B. carbon dioxide
- C. chlorine
- D. sodium chlorine
Explanation
Chlorine is widely used as a bleaching agent because it forms hypochlorous acid in water, which releases reactive oxygen species that oxidise coloured substances. Therefore option c is correct. Students may choose sodium chlorine because it sounds like a chlorine compound, but the correct compound name would be sodium hypochlorite, not sodium chlorine.
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About Reactions of Group I Elements
Group I elements have one valence electron, so their reactivity increases down the group as ionisation energy decreases. Their reactions with water, oxygen, hydrogen and halogens produce hydroxides, oxides, hydrides and halides, while the behaviour of lithium differs from the heavier metals because of its small ionic size.
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