Top five deadliest Chemical reactions

Acid rain

1- Hydrochloric acid and most things...

Hydrochloric acid (HCI) is an extremely strong acid. HCI reacts with most things - especially bases — and can corrode metal, cause chemical bums and even release flammable hydrogen

2- Acid rain

When sulphur dioxide is released into the air, it rises up and reacts with hydrogen peroxide which is found in some clouds. Sulphuric acid: a product of the reaction -falls back down to Earth and can have  devastating effects on flora, fauna and buildings/ statues, etc.

3- Nitroglycerine and heat

Nitroglycerin is one of the most explosive substances there is. The oily liquid is so sensitive that the slightest jolt or increase in heat can trigger a massive explosion.

4- Bleach and ammonia

When ammonia and bleach are mixed, the bleach decomposes to form hydrochloric acid.

Ammonia and chlorine gas react to form a deadly vapour : chloramine.

5- Mustard gas

The volatile combination of sulphur dichloride and ethylene reacts to form a cyclic sulphonium ion.This reacts with parts of DNA to prevent cells from replicating leading to tissue necrosis.