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Q.

Assertion: The burning of candle is both a physical and chemical change Reason: Burning of candle melts the wax and hence the physical state of wax has changed from solid to liquid. Again the wax combines with the atmosphere oxygen and changes to carbon dioxide, heat and light.


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a

Both Assertion and reason are correct and reason is the correct explanation for assertion.

b

Both Assertion and reason are correct and reason is not the correct explanation for assertion.

c

Assertion is correct but the reason is incorrect.

d

Both assertion and Reason are incorrect 

answer is C.

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Detailed Solution

When coal is burnt, the chief component carbon reacts with the oxygen present in the air and produces carbon dioxide. This is called combustion. Combustion is a chemical reaction. There is a change in chemical composition and this reaction cannot be reversed as carbon dioxide cannot be converted into coal again. Hence, the burning of coal is a chemical change.
 
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Assertion: The burning of candle is both a physical and chemical change Reason: Burning of candle melts the wax and hence the physical state of wax has changed from solid to liquid. Again the wax combines with the atmosphere oxygen and changes to carbon dioxide, heat and light.