Discussion
Which action neutralises spilled battery acid?
Answer: B
A mild alkali such as bicarbonate neutralises the acid, after which the area is washed with water. Water alone dilutes but does not neutralise, which makes the second option a partial measure. An acid cannot neutralise an acid. The order in which the effects act is what decides the outcome, so it is worth establishing first. Naming what changes and what stays the same is the reliable route through questions of this shape. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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