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Physical And Chemical Changes

Question

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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.

(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.

Solution

C.

(iii) Both processes A and B are chemical changes.

Some More Questions From Physical and Chemical Changes Chapter

Explain why rusting of iron objects is faster in coastal areas than in deserts.

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.

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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