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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. Which of the above changes is/are chemical change(s)?

A
Process – A is a chemical change.
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B
Process – B is a chemical change.
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C
Both processes A and B are chemical changes.
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D
None of these processes is a chemical change.
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Solution

The correct option is C Both processes A and B are chemical changes.
Both processes A and B are chemical changes.
As in both cases, there are new substances forming after the process.

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