what is a acid rain
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when sulphur di oxide or nitrogen oxides mix with the rain water, then the ph of rain water falls to less than or equal to 5.
this is called acid rain which is harmful for all living beings.
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The rain becomes acidic because carbon dioxide, sulphur dioxide and nitrogen dioxide ( which are released into the air as pollutants) dissolve in rain drops to form carbonic acid, sulphuric acid and nitric acid respectively. Acid rain can cause damage to building, historical monuments, plants and animals
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