Assertion :For a particular reaction, heat of combustion at constant pressure $(q_{P})$ is always greater than that at constant volume $(q_{V})$ . Reason: Combustion reactions are invariably accomplished by increase in number of moles.

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 D Both Assertion and Reason are incorrect
As we know,
$Δ H = Δ U + Δ n R T$
so if $Δ n = 0$
then, $Δ H = Δ U$
$q_{P} = q_{V}$

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