Assertion :Enthalpy of combustion is negative Reason: Combustion reaction can be exothermic or endothermic.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is C Assertion is correct but Reason is incorrect
When a substance undergoes combustion it releases energy. Combustion is always exothermic, the enthalpy change for the reaction is negative, ΔH has a negative sign.
Here, Assertion is correct but Reason is incorrect. Hence option C is correct