Question

Which one of these are the natural sources of inorganic pollutants $?$
(A) Volcanoes
(B) Mining
(C) Fuel combustion
(D) Pesticides

Answer 1

Hint : Inorganic pollutants are the compounds of inorganic by-products, arising due to radiant energy and noise, heat, or light. Petrochemical companies and man-made activities also release inorganic contaminants into the air. Inorganic pollutants found in water bodies are caused by human activities like mining, industry, or through agriculture.

Complete Step By Step Answer:
Organic pollutants include phenols, chlorinated phenols, endocrine disrupting chemicals, azo dyes, polyaromatic hydrocarbons, polychlorinated biphenyls, pesticides, etc. Whereas inorganic pollutants include a variety of toxic heavy metals such as arsenic, cadmium, lead, mercury, chromium, aluminium, nitrates and fluorides. They include pesticides such as DDT and lindane, industrial chemicals, which are the unwanted by-products of manufacturing and combustion processes.
Since mining, fuel combustion and pesticides all are Human sources of inorganic pollutants. But volcanoes are the natural source which emit some of the inorganic pollutants.
Hence, the correct Option is A. Volcanoes.

Additional Information:
The major sources of organic pollutants are Fossil Fuels, Organic chemicals, Particulate matter, Polycyclic aromatic hydrocarbons and Vehicle emissions. Organic pollution occurs naturally, inorganic pollution is a result of some human interaction or doing (such as fluoride in the water supply which is used to help teeth health).

Note :
Organic substances are substances that come from animal or plant sources. Organic substances always contain carbon. Inorganic substances are materials such as sand, salt, iron, calcium salts and other mineral materials. Inorganic substances are of mineral origin.