Question

Give reasons for the following observations:

(a) Air holes of a gas burner have to be adjusted when the heated vessels get blackened by the flame.
(b) Use of synthetic detergents causes pollution of water.

Answer 1

(a) We need to adjust air holes of gas burner so that sufficient oxygen-rich mixture is burnt to give a clean blue flame for complete combustion.

(b)Synthetic detergents are generally non-biodegradable, that is, they are not decomposed by microorganisms like bacteria. Hence, use of synthetic detergents causes water pollution in lakes and rivers.