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
1. Process-B is a chemical change
2. None of these processes is a chemical change
3. Process-A is a chemical change
4. Both processes A and B are chemical changes​

Answer 1

Answer:

3 rd

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Answer 2

Answer:

both process are chemical changes

option 4

because in both the reactions a new product or a new sybstance is formed

so,both are chemical changes

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