There is a crack in the battery case. Replace the battery.
No, but fumes from the battery acid can ignite with a spark.
Car battery acid consists of Hydrochloric acid and Sulphuric acid.
Car or automotive battery acid is 30-50% sulfuric acid
acid
It's an acid.
The pH of car battery acid is normally around 1 (extremely acidic).
Leaking battery acid can burn your skin. Im not sure if that qualifies as a rash, the correct term is chemical burn.
Lead - acid
It's an acid.
sulphuric acid
Sulphuric acid
It is sulphuric acid.