Discussion
Which hazard does charging a lead acid battery present?
Answer: B
Charging electrolyses water into hydrogen and oxygen, and a spark near the vents can ignite it violently. Acid mist is genuinely produced as well, which makes the last option a real secondary hazard. Ventilation and no naked flames are the rules. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb. The shared behaviour explains why these belong together and the differences explain why both exist. Reading the definition literally, rather than recalling a formula, is the reliable route through questions of this shape.
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