Statement–I: Standard enthalpy of compound is equal to its standard enthalpy of formation.Statement–II: T Δ Ssystem is the energy not available to do useful work.

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Both Statement-I and Statement-II are correct

Statement-I is correct and Statement-II is incorrect

Statement-I is incorrect and Statement-II is correct

Both Statement-I and Statement-II are incorrect

answer is A.

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Detailed Solution

I Ex− Cgraphite + O2g → CO2g ; ΔfoH=ΔHStandard enthalpy values of graphite & O2g are assumed to be zero.∴ ΔfoH=HPo−HRo =HPo ∵ HRo=0

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