Question

what is meant by acid rain

Answer 1

Acid rain is rainfall that has been acidified. Rain is acidified by oxides of sulphur and nitrogen. Acid rain usually has a pH of less than 5.6. It is formed when pollutants called oxides of sulphur and nitrogen, present in factory smoke, and car exhaust, react with the moisture in the atmosphere.

Answer 2

◆ Acid Rain

Acid rain is the rain , which has been made more acidic than normal by the presence of dissolved pollutants, such as sulphur dioxide (SO2) and Nitrogen Oxides (NO2, NO3). These acidic Oxides enter into the atmosphere by combustion of fossil fuels in homes, transport and Industries. These gases arise from volcanic emissions also.


These gases are dissolved in water vapour present in the air and form corresponding acids like Sulphuric Acid (H2SO4) and Nitric Acid (HNO3) . They ultimately falls as Acid rain.


◆ Harmful Effects of Acid Rain :

Acid rain can corrode buildings and statues, especially those made with marble and stone. The limestone (marble) dissolves is Acid rain and slowly gets crumbled away. The phenomenan of corrosion of marble is also called " Marble cancer".