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.

Process – A is a chemical change.

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Process – B is a chemical change.

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Both processes A and B are chemical changes.

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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.
Correct answer: (iii) The process A and process B both are chemical changes.

● The process A involves the change of animal waste to a new substance biogas. So, process A is chemical change.

● The process B involves the burning of biogas as fuel which produces new substances like carbon dioxide and heat. So, process B is also a chemical change.

$Biogas ⟶ Carbon dioxide (C O 2) + Heat$

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Similar questions

Q. 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)?

Anaerobic bacteria digest animal wastes and produces biogas (change=A) . The biogas is then burnt as fuel (change=B) . The following stamens pretain to these changes . Choose the correct one :

(a) A is a chemical change (b) B is a chemical change

(d) A and B are physical changes.

Q. Question 12
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)?
(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

Question 11

State whether the following statements are true or false:

(a) When a candle burns, both physical and chemical changes take place.
(b) Anaerobic bacteria digest animal waste and produce biogas.
(c) Ships suffer a lot of damage though they are painted.
(d) Stretching of rubber band is not a physical change.

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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.​

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.