Consider the following statements When the pH of the rain water drops below 5 6 it is called acid ra...........

Environment and Ecology Others

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Consider the following statements

When the pH of the rain water drops below 5.6, it is called acid rain.
Oxides of nitrogen, sulphur and sodium are mainly responsible for acid rain.
Acid rain may contaminate drinking water.

Choose the correct statements by using the code given below

1 and 2 only

2 and 3 only

1 and 3 only

All of the above

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Explanation:

1 and 3 only

Acid rain refers to any precipitation (rain, fog, mist, snow) that is more acidic than normal (pH of less than 5.6. pH below 7 is acidic).
Acid rain is caused by atmospheric pollution from acidic gases such as sulphur dioxide and oxides of nitrogen emitted from the burning of fossil fuels.
It is also recognized that acidic smog, fog, mist, move out of the atmosphere and settle on dust particles which in turn accumulate on vegetation as acid depositions.

When rain falls, the acid from these depositions leak and form acid dews.
Gases that cause acid rain

Acidic gases	Source
SOx(Sulphur oxides)	Fossil fuel burning, power plants, smelting of metal sulphide ores, industrial sources, industrial production of sulfuric acid in metallurgical, chemical and fertiliser industries volcanoes, seas and oceans, decomposition of organic matter.
NOx (Nitrogen oxides – NO, NO2and N2O)	Fossil fuel burning, lightning, biomass burning, forest fires, oceans, power plants.

Acid rain can alter the pH value of surface water, which can causes severe damage to the aquatic life that lives in surface waters and contaminate the drinking water.