They will not explode. They can however burst.
They will not explode. It may expand and burst due to corrosion.
No, it will not explode.
Yes, it very well may explode.
If you reverse the battery cables, yes the battery can possibly explode.
Yes it could over heat and explode. Don't do it.
The battery will explode.
If you explode you die and the same applies to a car battery.
Yes, a car battery can explode if jumped improperly. Car batteries contain sulfuric acid that can produce gasses. If a spark ignites the gases the battery can explode like a bomb.
Yes
It can explode.
Yes, if you short the battery out it can explode and burn you.
Both B and C. DC is polarity specific, by reversing polarity with a charger you are causing current to flow backwards through the battery (internal) this could cause the electrolyte to heat up giving off a gas that expands and could eventually cause the battery to explode or just crack and leak. Most electrolytes in batteries are corrosive.