Which of the following pollutant is released in large quantity from the exhaust emission of a petrol/diesel automobile

Options

A. CO
B. `CO_2`
C. `NO_2 , SO_2 and Pb`
D. Hydrocarbons

Answer

B

Explanation

The largest part of most combustion gas is nitrogen `(N_2)` water vapour and carbon dioxide. These are non toxic although carbon dioxide is a green house gas that contributes to global warming. A relatively small part of combustion gas is undesirable, noxious or toxic substance such as carbon monoxide.