MHT CET Chemistry question

Heat of combustion is the

(A)Heat required to oxidize one gram molecule of a substance
(B)Heat evolved to completely oxidize one gram molecule of a substance
(C)The change in heat content of the system when one gram molecule of the substance is completely oxidizedCorrect
(D)Cannot be determined

Answer: (C)

Solution

Heat of combustion is the enthalpy (heat content) change when one mole of a substance is completely oxidised (burnt) in oxygen; (a) wrongly says heat is required, and (d)

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Question ID VK-064085