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Pick out the correct statement?

AIf an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase
BA process is irreversible as long as Δ S for the system is greater than zero
CThe mechanical work done by a system is always equal to∫P.dV
DThe heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants

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