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Question

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 bums(Change-B).

Choose the correct one :

Process-A is a chemical change.
Process-B is a chemical change
Both processes A and B are chemical changes
None of these processes is a chemical change

A

Process-A is a chemical change.

B

Process-B is a chemical change

C

None of these processes is a chemical change

D

Both processes A and B are chemical changes

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Solution

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The correct option is B Process-B is a chemical change
Change A is physical change - In this change, the liquefied gas changes it states from liquid to gas and hence no new substance are formed.

Change B is chemical change:- Burning produces new substance and hence the reaction can't be reversed back.

$G a s b u r n i n g - --- \to {C O}_{2} + h e a t + o t h e r s u b s t a n c e$

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