Question

Nitrogen oxides produced from the emission of automobiles and power plants, are the sources of fine particles, which lead to
A. Photochemical smog
B. Dry acid deposition
C. Industrial smog
D. Wet acid deposition
E. Both B and D

Answer 1

Pollutant is a substance or compound that when introduced in nature or environment gives some undesired effects and pollutes the environment which in turn affects the usefulness of the environment. Examples of pollutants are carbon dioxide, nitrogen dioxide and other nitrogen oxides, sulphur dioxide, etc.

Complete step-by-step answer: Photochemical smog is a type of smog produced when nitrogen oxides in the atmosphere react with ultraviolet rays from the sun. Photochemical smog is composed of primary and secondary pollutants, where nitrogen oxides are primary pollutants which react with hydrocarbons to form peroxyacyl nitrate which is a secondary pollutant. The secondary product leads to photochemical smog formation. Photochemical smog is visible as a brown haze and it is more prominent during morning and afternoon, especially in densely populated, warm cities.
Dry acid deposition is a form of acid deposition in the atmosphere when gases and dust particles become acidic. Dry deposition of acid is carried to long distances by wind.
Industrial smog contains two primary components sulphur dioxide and particulates which include soot from burning coal and dust. These components combine with water in fog to produce acid rain.
Wet acid deposition is rain, sleet, snow, or fog that becomes more acidic than usual. Acid deposition in wet and dry forms falls on buildings, cars, trees and causes damage to them.

Hence, the correct answer is option A.

Note: Photochemical smog is a problem of modern industrialization, it is more common in modern cities with dry climate.