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

(c) A and B are chemical changes.

(d) A and B are physical changes.

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Solution

c) A and B are chemical change

All digestive process are chemical processes.
Macromolecular substance are broken down.
Biogas is one of the several products.

Burning of biogas is also a chemical change.
All burning are chemical reaction with oxygen.

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Similar questions

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.

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

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.

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.

The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A) then it burns (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.

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c) A and B are chemical change All digestive process are chemical processes. Macromolecular substance are broken down. Biogas is one of the several products. Burning of biogas is also a chemical change. All burning are chemical reaction with oxygen.

c) A and B are chemical change

All digestive process are chemical processes.
Macromolecular substance are broken down.
Biogas is one of the several products.

Burning of biogas is also a chemical change.
All burning are chemical reaction with oxygen.