Question

Among the following which one causes more indoor chemical pollution?
a. burning coal
b. burning cooking gas
c. burning mosquito coil
d. room spray


NCERT Class XII
Biology - Main Course Book

Chapter 16. Environmental Issues

Answer 1

The answer is : (a) burning coal

Answer 2

Burning coal causes more indoor pollution chemically.

Explanation:

It causes more chemical pollution than others like burning cooking gas, burning mosquito coil and room spray. Burning coal produces carbon in the atmosphere and by reacting oxygen from the environment it produces $CO_{2}$ or carbon dioxide or carbon monoxide in the environment.

These two gases are the life threatening for human being. Burning coal also produces some particles like nitrogen oxides and sulphur dioxide in the form of metal and silicates.