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.
A) Process A is a chemical change B) Process B is a chemical change C) Both processes A and B are chemical changes D) None of these processes is a chemical change.
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Answer:Both A and b is a chemical change.
Explanation: In change A the anaerobic bacteria reacts upon the animal waste and a new substance is formed called biogas which has completely changed the property and is irreversible hence is a chemical change.
Change B is also a chemical change because the biogas is burnt as fuel and burning process is a chemical change as a new molecule is released called carbon dioxide.
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