Question 11
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.
Which of the processes is a chemical change?
(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.

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Solution

The correct answer is option (ii) Process – B is a chemical change.
Process – B is a chemical change, Because, as the LPG burns, it gives out energy and also gases like Carbon dioxide. As there is a new compound formed after this process it is called a chemical change.
Whereas Process-A is a physical change because only the physical state of LPG gas changes from liquid to gas state.

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Q. Question 12
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