Anaerobic bacteria digest animal waste and produce biogas (Change-A). The biogas is then burnt as fuel (Change-B). The following statements pertain to these changes. Choose the correct one.(i) Process-A is a chemical change.(ii) Process-B is a chemical change.(iii) Both processes A and B are chemical changes.(iv) None of these processes is a chemical change.

Anaerobic bacteria digest animal waste and produce biogas (Change-A).

1.	Anaerobic bacteria digest animal waste and produce biogas (Change-A). The biogas is then burnt as fuel (Change-B). The following statements pertain to these changes. Choose the correct one.(i) Process-A is a chemical change.(ii) Process-B is a chemical change.(iii) Both processes A and B are chemical changes.(iv) None of these processes is a chemical change.
Answer» (iii) Both processes A and B are chemical change.