In diaphragm cell level of brine in anode compartment is kept slightly higher which prevents_______________?
Correct answer: A. Hydroxide ions to reach anode
- A. Hydroxide ions to reach anode
- B. Chlorine gas to mix
- C. Cathode to decay
- D. All of the above
Explanation
In a diaphragm cell, the anode compartment is kept at a slightly higher liquid level so brine flows towards the cathode compartment. This prevents hydroxide ions formed at the cathode from diffusing to the anode, where they would react with chlorine. Students may choose b by thinking the level directly prevents chlorine from mixing, but the diaphragm mainly controls hydroxide-ion movement.
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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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