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

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Solution

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

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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.

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.

Question 11
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.
Which of the processes is a chemical change?
(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.

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.

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.

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

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