Depends on your definition of "accurate"
Guns
Neither is more inherently accurate than the other.
a nuke
Example:The man had a accurate aim with a weapon.
The most common method was with artillery.It is NOT a biological weapon, it is a chemical weapon.
A paper clip is not the deadliest weapon in the world. In fact, the weapon that can do the most damaged when used by man is a flamethrower.
There can be no doubt that the most deadliest weapon of world war 2 was the nuclear bombs that dropped on Hiroshima.
the tank
Propaganda.
Yes.
Mustard Gas
The most widespread firearm is by far and away the AK-47, but the most widely used weapon? probably a simple knife/machete