Question

please give me the answer as fast as possible​

Answer 1

Answer:

answer (b) ●●●●●●●

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Answer 2

Answer:

Both processes A and B are chemical changes.

Explanation:

Ncert solutions

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Mathematics

Science

Chapters in NCERT Solutions - Science , Class 7

Exercises in Physical and Chemical Changes

Question 23

Q12) 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 change.

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