Anaerobic bacteria digest animal waste and produce biogas (change - A ).
The biogas is then burnt as fuel (change - B).
Choose the correct statement:
1
Process - A is a chemical change and Process - B is physical change.
2
Process - A is a physical change and Process - B is chemical change.
3
Both the Processes A & B are chemical changes.
4
Both the Processes A & B are physical changes.