Assertion : $Δ H$ for an exothermic reaction is negative and for an endothermic reaction is positive. Reason: Enthalpy is an extensive property.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Enthalpy depends on the quantity of matter of the system so it is an extensive property.
For exothermic reaction, heat is evolved while for endothermic reaction heat has to be supplied. So, for exothermic reaction $Δ H < 0$ and for endothermic reaction, $Δ H > 0$ .

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