Concept:Decomposition of organic matter releases several gases depending on oxygen availability.
Among the given options, the gas directly associated with putrefaction is hydrogen sulphide.
Explanation:During aerobic decomposition, organic matter mainly produces carbon dioxide
CO2.
During anaerobic decomposition, gases like methane
CH4 and ammonia are released.
When sulphur-containing proteins decompose, hydrogen sulphide
H2S is formed, giving a rotten-egg smell.
Carbon(II) oxide
CO and sulphur(IV) oxide
SO2 are products of incomplete combustion or burning of fuels, not typical decomposition gases.
Nitrous oxide
N2O is produced in soils by microbial nitrification, but it is not the main gas released during the decay of organic matter.
Therefore, among the choices, hydrogen sulphide is the correct gas released during decomposition.
Answer:C. Hydrogen Sulphide