Question

Why is it necessary to remove sulphur from petroleum products?

• A. To reduce the emission of sulphur dioxide in exhaust fumes
• B. To increase efficiency of automobiles engines
• C. To use sulphur removed from petroleum for commercial purposes
• D. To increase the life span of engine silencers

Answer 1

Answer: (A)

To reduce the emission of sulphur dioxide in exhaust fumes

Answer 2

By removing sulphur from petrol and diesel, the emission of $SO_2$ can be reduced in exhaust. $SO_2$ is a very harmful air pollutant. It can damage the vegetation by causing chlorosis. It can cause acid rain (by forming $H_2SO_3$ and $H_2SO_4$), damaging buildings and plants. In human beings it causes irritation in eyes and damage to respiratory system (e.g., bronchitis).