JAMB - Chemistry (2005 - No. 24)
Natural water collected from rivers and ponds contain oxygen, carbon (IV) oxide and
nitrogen
hydrogen
chlorine
sulphur
oxide
توضیح
Pond water does contain nitrogen, in various forms like ammonia, nitrite, and nitrate, which are essential nutrients for aquatic life and play a crucial role in the pond's ecosystem.
Nitrogen enters ponds through various sources, including rainfall, wind, run-off from land, and the decomposition of organic matter like leaves, twigs, and fish waste.