Question

The smog is essentially caused by the presence of
(A) \[{{O}_{2}}\text{ }and\text{ }{{O}_{3}}\]
(B) \[{{O}_{3}}\text{ }and\text{ }{{N}_{2}}\]
(C) Oxides of sulphur and nitrogen
(D) \[{{O}_{2}}\text{ }and\text{ }{{N}_{2}}\]

Answer 1

Hint: Smog is a type of air pollution. Smog is going to form by the mixture of smoke and fog in the air. The pollutants or gases that cause smog are released into the air by burning of fuels. This pollutant reacts with sunlight and fine particles present in the atmosphere causes the formation of smog.

Complete step by step answer:
-Smog is caused by an increase in air pollution.
-Due to the photochemical reaction between volatile organic compounds (Fuels), oxides of sulphur, and oxides of nitrogen, a large amount of ozone and fine particles are released into the air.
-The fuels, oxides of sulphur and oxides of nitrogen are called precursors because they are reasonable for the formation of the smog.
-Therefore oxides of sulphur and nitrogen are reasonable for the formation of smog.

So, the correct option C.

Additional information:
-Smog reduces visibility.
-Ground-level ozone (smog) formed by the photochemical reaction damages the tissues in the lung and causes respiratory illness like asthma.
-Smog is not only dangerous to humans and animals it creates problems in plants also.
-Smog is a big problem in urban areas due to the emission of large amounts of smoke due to the burning of fuels.

Note: Smog is different from the smoke. Smog is a mixture of smoke and fog. But smoke contains only gaseous particles. Smog is heavier than smoke. The smog developed by sulphur oxides is called sulfurous smog also known as London smog.