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.
(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 changes.
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Answer 1

Answer:

(iii) Both processes A and B are chemical changes