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.
Answers
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12)(iii) answer
3) (iii) answer
Anonymous:
Answer of twelfth question is option (ii)
Answered by
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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.
HOPE IT HELPS
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