Question

2. Observe the following two changes. Change A: Biogas is produced by decomposition of animal
and plant waste by anaerobic bacteria. Change B: Biogas is burnt as other fuels. Which of these is
a chemical change?
(a) Change A
(b) Change B
(c) Both (a) and (b) (d) None of these​

Answer 1

Answer:

None of these​

Explanation:

Answer 2

Answer:

both a and b . is the right answer

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