Question

which of the following gases are mostly produced during landfill?
oxygen and hydrogen
carbon dioxide and methane
methane and oxygen
oxygen and argon

Explanation:

In landfills, organic waste decomposes anaerobically. This process mainly produces carbon - dioxide and methane. Oxygen is consumed rather than produced in anaerobic decomposition in landfills, and hydrogen, argon are not major products.

Answer:

Carbon dioxide and methane