Question

Respiratory disorders occur due to automobile exhaust because of the release of
A) CO
B) $NO_2$
C) $CO_2$
D) $O_2$

Answer 1

Hint:Respiratory disorder is a type of disease that harms the respiratory organs like lungs. Asthma, chronic bronchitis, chronic obstructive pulmonary disorder(COPD) are some of the respiratory diseases caused due to infection, smoking tobacco, and other forms of air pollution.

Complete Answer:
Air pollution is caused by the suspension of the liquid and solid particles of gases in the atmosphere. These suspensions come from the vehicles, factories, volcanoes etc. Vehicle's exhausts contributes the major portion of air pollution. They release the toxic pollutants such as hydrocarbons, carbon monoxide, carbon dioxide, lead, nitrogen oxide, ammonia etc. which causes air pollution and makes the air unfit for the intake of living beings. When humans breathe this polluted air, they cause various types of respiratory disorders like asthma. One of the harmful pollutants released by the automobile exhaust is carbon monoxide(CO).
Carbon monoxide enters the bloodstream by combining with haemoglobin which results in the formation of carboxyhemoglobin . This reduces the oxygen delivering capacity of blood. In severe cases it mated to death.

Hence the correct answer is option (A) CO( carbon monoxide).

Note: Though automobile exhaust releases both carbon dioxide and carbon monoxide, carbon dioxide is not considered as a much harmful gas because it doesn't form any bond with the haemoglobin, whereas carbon monoxide forms carboxyhemoglobin which is fatal.