Anaerobic bacteria digest animal waste and produce biogas(Process-A). The biogas is then burnt as fuel(Process-B). The following statements pertain to these changes. Choose the correct one.
Process-A is a chemical change and process B is a physical change.
Process-B is a chemical change and process A is a physical change.
Both processes A and B are chemical changes.
None of these processes is a chemical change.
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Correct option is C)
Concept:Physical Change: Properties like size, shape, state (solid, liquid, or gas), temperature, pressure, etc., are physical properties. Those changes in which only physical properties of a substance change are called physical changes. There is no change in chemical composition. Chemical Change: The change in which a new substance is formed and the chemical composition of a substance are changed is called a chemical change. A substance loses its identity in a chemical change and cannot get back into its original form. Correct Option: C
Explanation for correct option:Change A and change B both are chemical changes. As both the reaction are irreversible and they lead to the formation of new substances. There is also a change in the chemical properties of the reactants in both processes A and B.
Animal waste anaerobicbacteria Bio gas (CH4)
Bio gas burningCO2+othersubstances.
Explanation for incorrect options: according to given explanation both processes A and B are chemical changes. Hence, correct option is C.