Statement - I : Halogens have maximum negative electron gain enthalpy in the respective periods of the periodic table
Statement - II : Halogens have the smallest size in their respective periods and high effective nuclear charge

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Both statements I and II are correct

Statement-I is incorrect and statement-II is correct

Both statements I and II are incorrect

Statement-I is correct and statement-II is incorrect

answer is A.

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Detailed Solution

The halogens are the nearest elements to the noble gases in terms of gaining electrons and achieving noble gas electronic configuration.
Electron gain enthalpy is the amount of energy released when an electron is added to the neutral gaseous atom.
The halogen have a strong tendency to accept electrons due to their small size and effective nuclear charge so they have maximum negative electron gain enthalpy (because the energy is being released in the process) in their respective periods of the periodic table.

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