The most TOXIC is the Inland Taipan
Inland Taipan has a neurotoxic effect so reacts speedily but I disagree about being the most TOXIC.
The most DANGEROUS is the Black Mamba (aggressive & fast acting toxic venom)
The most dangerous is the animal that is treated with complacency so can be any animal that is able to stop the handler breathing.
The black mamba is not an aggressive snake but will defend itself aggressively.
Most VENOMOUS (venom yield) is the King Cobra
I agreed that this animal at an average length of 3.7 m (12 ft) to 5.5 m (18 ft) and is capable of flattening an elephant in about four hours but the King Brown, Mulga, Pseudechis australis delivers the most venom yield out of all snakes world wide.