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Frequently Asked Question
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Which of these is/are TRUE about mercury and silver-zinc button batteries? i. Zinc is the anode in both batteries ii. Mercury is the anode in mercury battery while silver is the anode in silver-zinc battery iii. HgO and Ag₂O are the cathodes in mercury and silver-zinc batteries, respectively iv. Both are primary batteries, hence rechargeable
Accepted Answer
Here's the breakdown of the statements about mercury and silver-zinc button batteries:
I. Zinc is the anode in both batteries: TRUE In both mercury and silver-zinc batteries, zinc acts as the anode, undergoing oxidation and releasing electrons.
II. Mercury is the anode in mercury battery while silver is the anode in silver-zinc battery: FALSE As mentioned above, zinc is the anode in both battery types.
III. HgO and Ag₂O are the cathodes in mercury and silver-zinc batteries, respectively: TRUE Mercury(II) oxide (HgO) serves as the cathode in mercury batteries, while silver oxide (Ag₂O) acts as the cathode in silver-zinc batteries. These metal oxides accept electrons during the battery's operation.
IV. Both are primary batteries, hence rechargeable: FALSE Both mercury and silver-zinc batteries are primary batteries, meaning they are not designed to be recharged. They are single-use batteries.
In summary, statements I and III are true, while statements II and IV are false.
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