Question

What is the main cause of acid rain?
A. Pollution
B. Deforestation
C. Afforestation
D. Excessive rains

Answer 1

Hint: Acid rain is the precipitation of acid in the form of rain. When atmospheric pollutants like oxides of nitrogen and Sulphur react with rainwater and come down with rain, then this results in Acid rain. It is caused by a chemical reaction that begins when compounds such as Sulphur dioxide and oxides of nitrogen are released into the air.

Complete step by step answer:
Acid rain is made up of highly acidic water droplets due to air emissions, most specifically the disproportionate levels of Sulphur and nitrogen emitted by vehicles and manufacturing processes.
Now, the acidic deposition takes place in two ways i.e. wet and dry. The wet deposition is any form of precipitation which removes acids from the atmosphere and places tem on the surface of the earth whereas in the absence of precipitation, dry deposition of polluting particles and gases sticks to the ground through dust and smoke.
However, the main cause of acid rain is pollution. This is because acid rain is caused when the compounds like Sulphur dioxide and nitrogen oxides are released in air and these compounds very easily dissolve in water and can be carried very far by the wind.
However, these substances can rise very high into the atmosphere, where they mix and react with water, oxygen and other chemicals to form more acidic pollutants, known as acid rain.

Hence, option A is correct.

Note:
The ecological consequences of acid rain are seen most strongly in marine habitats, such as streams, lakes and marshes. Acidic rainwater can leach aluminium from soil clay particles as it flows through the soil and then floods into streams and lakes.