Question

What are man-made sources of acid rain?
A. Exhaust from vehicles
B. Burning fuels
C. Isoprene emissions
D. All of above

Answer 1

Acid rain can be caused due to accumulation of sulfur dioxide and nitrogen oxides in the atmosphere. The main causes that can increase concentration of these gases in the atmosphere are industries, vehicles, volcanoes and also isoprene emissions.

Complete answer:
Acid rain is also called acid deposition. It contains acidic compounds such as sulfuric or nitric acid that fall to the ground from the atmosphere in wet or dry forms. It includes rain, snow, fog, hail, or even dust that is acidic. The main causes of the acid rain include sulfur dioxide (SO2) and nitrogen oxide (NO2). They are emitted into the atmosphere and transported by wind and air currents. When the sulfur dioxide and nitrogen oxide react with water, oxygen and other chemicals it form sulfuric and nitric acids. Natural cause of the acid rain is volcanoes.
Some of the major causes of acid rain are given below:
Burning of fossils fuels to generate electricity can increase SO2 and NO2 in the atmosphere. Electric power generators increase the level of these gases in the environment.
Smoke from vehicles and heavy equipment can also be the cause of acid rain.
Industries such as oil refineries and manufacturing industries also increase the concentration of these gases in the atmosphere.
Isoprene emission can react with nitrates and organic acids and contribute to the acidification of the rainwater.
From the above information we have found the exhaust from vehicles, burning fuels, isoprene emissions can cause acid rain.

Hence, the correct answer is option (D).

Note: Acid deposition can be of two types that is: wet deposition and dry deposition. Wet deposition is commonly called acid rain. Dry deposition occurs in the absence of the moisture. Deposition of acidic particles and gases may deposit to the surface quickly and react during atmospheric transport. It can be harmful to human health. Dry deposition of acids depends on the amount of rainfall an area receives.