Question

what is the dangerous aside in the world?

Answer 1

Hydrofluoric acid is a highly corrosive liquid and is a contact poison. It should be handled with extreme care, beyond that accorded to other mineral acids. Owing to its low dissociation constant, HF as a neutral lipid-soluble molecule penetrates tissue more rapidly than typical mineral acids.

Answer 2

Hydrofluoric acid is the dangerous aside in the world.