Which of the following process refers to ionisation potential ?

1.	Which of the following process refers to ionisation potential ?
Answer» `X_((s)) to X_((g))^(+) + E^(-)` `X_((g)) + aq to X_((aq))^(+) + e^(-)` `X_((g)) to X_((g))^(+) + e^(-)` `X_((g)) + e^(-) to X_((g))^(-)` ANSWER :C

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