Statement-1: Fluorine has a less negative electron gain enthalpy than chlorine.

Statement-2: There is relative greater effectiveness, of 2p-electron in the small $\mathrm{F}$ atom to repel the additional electron entering the atom than to Sp-electrons in the larger $\mathrm{Cl}$ atom.

The little Fatom's 2p electrons are more effective at repelling the extra electron than the larger Cl atom's 3p electrons are at doing the same. As a result, fluorine has a lower affinity for negatively charged electrons than chlorine. As a result, both the claim and the reason are true, and the reason provides a valid justification for the assertion.