Ncert solutions

Ncert solutions

Grade 7

Physical and Chemical Changes | Exercise

Question 12

Q12) 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 12:

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

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subject-cta

Question 12

Q12) 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 12:

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

Still have questions? Our expert teachers can help you out

Book a free class now

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subject-cta
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