The acids present in acid rain are _________.
(i) Peroxyacetylnitrate
(ii) H2CO3
(iii) HNO3
(iv) H2SO4

Answer: Option (ii), (iii), (iv)
The acids present in acid rain primarily include H2CO3 (carbonic acid), HNO3 (nitric acid), and H2SO4 (sulfuric acid). These acids are formed when certain pollutants, such as sulfur dioxide (SO2) and nitrogen oxides (NOx), are released into the atmosphere from sources like industrial emissions and vehicle exhaust. When these pollutants react with water vapor and other atmospheric components, they undergo chemical reactions to produce these acids.
For example, the formation of sulfuric acid (H2SO4) in the atmosphere can be represented by the following reaction:
SO2(g) + O2(g) → 2SO3(g)
2SO3(g) + H2O(l) → H2SO4(aq)

This sulfuric acid, along with nitric acid and carbonic acid, can then be carried by rainwater or other precipitation and result in acid rain when it falls to the ground.

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