Discussion
Generally the rain water having pH ......................... is considered as acid rain.
Answer: B
Acid rain is rain with a pH less than 5.6.
Even unpolluted rain is slightly acidic: carbon dioxide dissolves in it to form carbonic acid, and water in equilibrium with atmospheric carbon dioxide has a pH of about 5.6. Rain is called acid rain only when it is more acidic than that, which happens when sulphur dioxide and nitrogen oxides form sulphuric and nitric acids.
A pH above 5.6 is less acidic than natural rain. A pH of 7 is neutral, and a pH of 10 is alkaline, so neither describes acid rain.
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