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Electron gain enthalpy with negative sign of fluorine is less than that of chlorine due to:

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High ionization enthalpy of fluorine

Smaller size of chlorine atom

Smaller size of fluorine atom

Bigger size of 2p orbital of fluorine

answer is C.

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Detailed Solution

F-atom has smaller size and incoming $e^{-}$ feels more repulsion from already present $e^{-}$ in F-atom hence, electron gain enthalpy with negative sign (electron affinity) of fluorine is less than that of chlorine.

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