Microbiology of Soils
Which of the following statement is not true about composition of biogas?

It also contains with traces of H2S, N2, H2and CO
Both (a) and (b)
It also contains with traces of O2 and Cl2
It is composed almost exclusively of methane and carbon dioxide

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Microbiology of Soils
Denitrification is

both (a) and (b)
changing of atmospheric nitrogen (N2) to nitrogen compounds
reduction of nitrate to organic nitrogen compounds
reduction of nitrate (NO3-) to nitrogen gas

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