Question

19. 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:
(1 Point)
A is a chemical change
where as B is a Physical
change.
B is a chemical change
where as A is a Physical
change.
Both A and B are Physical
changes
both A and B are chemical changes​

Answer 1

Answer:

Both A and B are chemical changes

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