Atmosphere H2CO3 is not considered as a component of acid rain because ans. It is not produced during precipitation. It decreases the pH level of water negligibly small amount. It is harmless to aquatic plants and animals. It is not an acid.

H2CO3, also known as carbonic acid, is not considered a component of acid rain for several reasons:

1. It is not produced during precipitation: Acid rain is primarily caused by the emission of sulfur dioxide (SO2) and nitrogen oxides (NOx) into the atmosphere. These gases react with water, oxygen, and other substances to form sulfuric acid and nitric acid. Carbonic acid is not produced in this process.

2. It decreases the pH level of water negligibly small amount: While carbonic acid can contribute to the acidity of rain, its effect is relatively small compared to that of sulfuric and nitric acids. Therefore, it is not considered a significant component of acid rain.

3. It is harmless to aquatic plants and animals: Carbonic acid is a weak acid and is not harmful to aquatic life in the same way that sulfuric and nitric acids are. In fact, carbonic acid is a natural part of the carbon cycle and is essential for life on Earth.

4. It is not an acid: This statement is incorrect. Carbonic acid is indeed an acid. However, it is a weak acid and does not contribute significantly to the acidity of rain.