The carbonaceous demand occurs due to oxidation of-

Correct option is B

The correct answer is (b) Organic matter.
· Carbonaceous demand refers to the oxygen required for the oxidation of organic matter present in water or wastewater. This is a measure of the amount of dissolved oxygen needed by aerobic biological organisms to break down organic compounds.
· It is an essential parameter in determining the biochemical oxygen demand (BOD) of water, which helps assess the level of organic pollution in water bodies.
Information Booster:
Ammonia:
· The oxidation of ammonia in water is related to nitrogenous demand, not carbonaceous demand. It involves the conversion of ammonia to nitrite and then to nitrate, consuming oxygen in the process.
Nitrogen:
· Nitrogen compounds, particularly ammonia, contribute to the nitrogenous demand rather than carbonaceous demand.
Sulphur:
· The oxidation of sulphur compounds, such as hydrogen sulfide, does not contribute to carbonaceous demand but can cause oxygen depletion in water through a different process.