Question

12. 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. With propez Season -
(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.
3, 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, (NCERT) with proper reason
(i) Process - A is a chemical change.
(ii) Process -B is a chemical change.
(ii) Both processes A and B are chemical changes.
(iv) None of these processes is a chemical change.

Answer 1

12)(iii) answer

3) (iii) answer

Answer 2

Answer: 12. Change 'a' is physical change and change 'b' is chemical change. So option (ii) is correct.

3. Change 'a'and change 'b' both are chemical changes. So option (iii) is correct.

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