Discussion
Which substance is consumed from the electrolyte during discharge?
Answer: D
Sulphate ions leave the electrolyte for the plates and water is produced, so the specific gravity falls. That is precisely why a hydrometer reads the state of charge. The change of density is the direct chemical consequence. Naming what changes and what stays the same is the reliable route through questions of this shape. The shared behaviour explains why these belong together and the differences explain why both exist.
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