Question

in biogas plant which product is formed by the combustion of elemental carbon

Answer 1

Biogas is a combustible gaseous fuel that is collected from the microbial degradation of organic matter in anaerobic conditions.  Biogas is principally a mixture of methane (CH4) and carbon dioxide (CO2) along with other trace gases.  Biogas can be collected from landfills, covered lagoons, or enclosed tanks called anaerobic digesters.

Answer 2

Biogas is formed by  combustion of elemental carbon which contains methane(CH4= 50-70%), carbon dioxide( CO2 = 25-50%), nitrogen(N2=0-10%) and hydrogen(H2 = 0-1%).