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.

Both A and B are chemical changes.

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Both A and B are physical changes.

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Process A is a physical change but B is a chemical change.

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Process A is a chemical change but B is a physical change

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Solution

The correct option is C
Process A is a physical change but B is a chemical change.

Liquefied petroleum gas (LPG) exists as a liquid inside the cylinder. This liquid LPG changes into gas when it comes out, denoted by change-A. This is a reversible change as gaseous LPG can be converted into liquid LPG. So this is a physical change.
However gaseous LPG burns, denoted by change-B. This is an irreversible change since it alters the chemical composition of LPG. Hence this is a chemical change.

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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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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.

The gas we use in the kitchen is called liquified petroleum gas .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],identify the types of changes. Justify reason.

Q. 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?

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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.

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.