Question

Biogas is a mixture of:
A.Oxygen, carbon dioxide, methane
B.Nitrogen, oxygen
C.Methane, nitrogen, hydrogen
D.None of these

Answer 1

Hint: To answer this question one must be aware of the basic terms used in environmental chemistry. In this question, we will be focusing on the composition of biogas. As the name biogas describes that it is a mixture of gases. So using the basic terms used in environmental chemistry we will give the composition of biogas.

Complete step by step answer:
As we know that ‘Biogas’ is the term mainly used in environmental chemistry. So, first, we will understand environmental chemistry. Environmental chemistry is the study of scientific methods and the chemicals that occur naturally.
Biogas is the mixture of gases produced by the breakdown of organic matter anaerobically which means in the absence of oxygen.
Biogas is mainly a mixture of methane \[\left( {C{H_4}} \right)\], carbon dioxide \[\left( {C{O_2}} \right)\] , and some amount of oxygen. The composition of these gases is methane \[\left( {45\% - 75\% } \right)\] and carbon dioxide \[\left( {25\% - 50\% } \right)\].
So we can conclude that Biogas is a mixture of oxygen, carbon dioxide, methane, and some more gases in a very less amount.

Hence, the correct option is (A).

Note:
Biogas can be used in a gas engine to convert the energy in the gas into heat and electricity.
Biogas is a mixture of combustible gases with a small amount of ammonia, nitrogen, and hydrogen sulfide.