Telangana TET Paper 1 Exam Model Paper 2

Concept:Acid rain is precipitation with pH below 5.6, caused mainly by acidic oxides of sulfur and nitrogen released into the atmosphere.Explanation:Sulfur dioxide ($SO_2$) and nitrogen oxides ($NO_x$) come from burning fossil fuels and volcanic eruptions.These gases oxidize in the air and react with water to form strong acids.For example: $2SO_2 + O_2 + 2H_2O \rightarrow 2H_2SO_4$ (sulfuric acid).Similarly: $4NO_2 + O_2 + 2H_2O \rightarrow 4HNO_3$ (nitric acid).Acid rain harms aquatic life, corrodes pipes, and damages stone/metal structures like the Taj Mahal ($CaCO_3 + H_2SO_4 \rightarrow CaSO_4 + H_2O + CO_2$).Normal rain is weakly acidic due to dissolved $CO_2$ forming carbonic acid, but acid rain is far more acidic.The term "acid rain" was first used by Robert Angus Smith in 1852.Answer:D. nitrous oxide and sulphur dioxide