At the liquid-gas boundary of the P-T phase diagram, which of the following statements is FALSE? A)The entropy of the liquid is equal to the entropy of the gas  B)The chemical potential of the gas is the same as that of the liquid  C)The gas and liquid phases are in equilibrium  D)The boundary slope is always positive   i know it is not b or c. I was thinking d because it cant always be a postive slope. help!

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