Electrolysis of dilute solution of NaCl results at the anode_______________?
Correct answer: D. oxygen
- A. sodium
- B. hydrogen
- C. chlorine
- D. oxygen
Explanation
In dilute aqueous sodium chloride, water is preferentially oxidized at the anode: 2H2O → O2 + 4H+ + 4e−. Chloride ions are discharged more readily only under suitable concentrated brine conditions, as in chlor-alkali manufacture. Students may choose chlorine because chloride is present, but dilution favours oxygen formation from water.
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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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