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The normal boiling point of a liquid 'X'...

The normal boiling point of a liquid 'X' is 500K. Which of the following statements are incorrect for the following process?
X(liquid) `->` X(gas)
At 500K & 1 atm pressure , `Delta G` = 0
At 500K & 0.2 atm pressure , `Delta G` = + e
At 500K & 1 atm pressure , `Delta G` = -ve
At 520K & 1 atm pressure , `Delta G` = +ve

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