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JEE Main levelSingle correct optionDifficulty 2 of 3ph019

Hydration enthalpy of $F X^{-}$ is the most negative among the halide ions mainly because

A $F X^{-}$ has the largest number of electrons
B $F X^{-}$ has the smallest ionic radius and hence the highest charge density
C $F X^{-}$ has the lowest electron gain enthalpy
D $F X^{-}$ has the largest ionic radius

Answer: B

Hydration enthalpy depends on charge density, i.e. charge divided by size.

F X^{-}

is the smallest halide ion, so it attracts water dipoles most strongly.

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