Discussion
Assertion (A): A galvanic oxygen cell has a limited service life even if it is never switched on.
Reason (R): Its anode is consumed by reaction with oxygen diffusing in whenever the cell is exposed to air.
Select the correct answer from the options below.
Answer: A
Both statements are true and the second is the reason. The cell has no off switch: as long as it sits in air, oxygen diffuses in and consumes the anode, so shelf life and service life run together and cells are supplied sealed in a foil pouch. Planning for replacement is part of owning the instrument. The contrast with a paramagnetic analyser, which has nothing to consume, is the clearest illustration of what the lower purchase price is buying.
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