Question

Why is biogas a better fuel than animal dung cakes?

Answer 1

Biogas is a better fuel than animal dung cakes because:
(i) Burning of animal dung cake causes lot of pollution whereas biogas is a smokeless fuel.
(ii) The calorific value of animal dung cake is much lower than that of biogas.
(iii) Animal dung cakes leave residue after burning whereas biogas leaves no residue.