In diaphragm cell hydrogen is discharged by the reduction of__________________?
Correct answer: A. Water
- A. Water
- B. HCI
- C. Na+
- D. NaCl
Explanation
At the cathode of a diaphragm cell, water is reduced more readily than sodium ions: 2H2O + 2e− → H2 + 2OH−. Thus hydrogen is produced from the reduction of water, while sodium hydroxide remains in solution. Students may choose Na+ because it is present in the electrolyte, but aqueous Na+ is not discharged preferentially.
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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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