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

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Microbiology of Soils
Denitrification is

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

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