The gas we use for cooking is called liquefied petroleum gas (LPG). It undergo two changes:
Change A: LPG exists as a liquid inside the cylinder and it get converted to gas on coming out.
Change B: LPG burns to produce heat.
Which of the following are correct?

Change A- Physical

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Change B- Physical

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Change A- Chemical

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Change B- Chemical

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Solution

The correct options are
A Change A- Physical
D Change B- Chemical
$∙$ During change A, LPG changes from liquid to gaseous state. It is physical change as no new substance is being formed and only phase change is taking place.
$∙$ Change B is a chemical change as the LPG burns, it gives out energy and also gases like carbon dioxide. As new substances are being formed here, it is a chemical change.

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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.
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The gas we use for cooking is called liquefied petroleum gas (LPG). It undergo two changes: Change A: LPG exists as a liquid inside the cylinder and it get converted to gas on coming out. Change B: LPG burns to produce heat. Which of the following are correct?

The gas we use for cooking is called liquefied petroleum gas (LPG). It undergo two changes:
Change A: LPG exists as a liquid inside the cylinder and it get converted to gas on coming out.
Change B: LPG burns to produce heat.
Which of the following are correct?