Is carbonic acid formed during acid rain?

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Solution

Carbonic acid is formed during acid rain.
Carbon dioxide reacts with water to form carbonic acid. Carbonic acid then dissociates to give the hydrogen ion (H+) and the hydrogen carbonate ion (HCO3-). The ability of H2CO3 to deliver H+ is what classifies this molecule as an acid, thus lowering the pH of a solution.
$C O 2 + H 2 O \to H 2 C O 3$

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