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Not how but WHY does acid rain form?

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Burning of fossil fuels emits sulphur dioxide.
S (in coal) + O2SO2

Sulphur dioxide reaches the atmosphere, it oxidizes to first form a sulphate ion.

2 SO2 + O2 2 SO3


The sulphate ion joins with hydrigen atoms in the air and becomes sulphuric acid. This then falls back down to earth as "acid rain"

SO3 + H2O H2SO4

Hope this at least helped a little c:
User Abhijith
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