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The gas we use in the kitchen is called liquified petroleum gas (LPG). In the cylinder it exist 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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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.

answer is B.

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Detailed Solution

Process A involves the transformation of LPG from liquid to gas, with no new substance formed. Hence, process A is a physical process.

Process B involves the burning of LPG to form new substances such as carbon dioxide and heat. So, process B is a chemical change.

$Burning of LPG ⟶ {CO}_{2} + Heat + Light$

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