Question

Name two gases that are responsible for acid rain?

Answer 1

Acid rain is caused by air pollution. Unpolluted rain water is slightly acidic due to the presence of gases in air. The gas combines with a water droplet to form an acidic solution with a $pH$ of about $5.6$ .

Complete step by step answer:
Effects of acid rain: Direct effect of plant growth due to toxication of soil, it takes away soil nutrients causing stunted growth, Block stomata pores of leaves, Microbes not able to tolerate low $pH$ and die and causes extensive damage to building structural materials of noble, limestone etc. Acid rain is very harmful to agriculture, plants, and animals. It washes away all nutrients which are required for the growth and survival of plants. It causes respiratory issues in animals and humans.
In polluted environments, the rain passes through an atmosphere polluted with oxides of sulphur and nitrogen. The falling rain reacts with oxides to form a mixture of ${H_2}S{O_4}$ and $HN{O_3}$ . This is known as acid rain.
The reaction involved in this process,
$S{O_2} + {H_2}O \to {H_2}S{O_4}$
So, Nitrogen dioxide and Sulphur dioxide are responsible for acid rain.

Additional Information
Cause of acid rain-
Natural cause- Volcanic emission, Biological process and lighting
Anthropogenic cause- Industrialization, motor vehicle, automobile exhausts, Domestic fire and smelter.
Solution of Acid rain- Transition to renewable energies, Education, Education, Reduce consumption level, Optimize fossil energy process and reduce automobiles.

Note:
However, when rain combines with sulfur dioxide or nitrogen oxides produced from power plants and automobiles the rain becomes more acidic. Typical acid rain has a $pH$ value of $4.0$ . A decrease in $pH$ values from $5.0$ to $4.0$ means the acidity is $10$ greater.