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Question

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.

A

Process-A is a chemical change

B

Process-B is a chemical change

C

Both processes A and B are chemical changes

D

None of these processes is a chemical change

Medium

Solution

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Correct option is
C

Both processes A and B are chemical changes

Change A and change B both are chemical changes.
As both the reaction are irreversible, they lead to the formation of new substances.
           Animal waste  Bio gas
                                 
          Bio gas   other substance.

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