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. 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

Best Answer

Correct option: Both processes A and B are chemical changes.

Solution: Production of biogas from animal waste by the action of bacteria is chemical change because new substance biogas is formed. Thus, process A is a chemical change. Biogas works as fuel and produces heat. Hence, process B is also a chemical change.

 

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