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JEE Main levelOne or more correct optionsDifficulty 2 of 3ph030

Select the correct statement(s) regarding periodic trends in the halogens.

AThe first ionisation enthalpy decreases from F to I.
BThe ionic radius of $F X^{-}$ is smaller than that of $Cl X^{-}$ .
CThe electron gain enthalpy of iodine is more negative than that of bromine.
DThe covalent radius of iodine is smaller than that of bromine.

Answer: A, B

A and B are correct: ionisation enthalpy falls as size increases, and each added shell makes the ion larger. C is wrong because Br (-325 kJ/mol) is more negative than I (-296 kJ/mol), and D is wrong because radius increases down the group.

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