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MolSynapse / Question bank / p-Block Elements: Groups 17 and 18 / Halogen compounds: HX, oxoacids, bleaching powder

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ph052

Select the correct statement(s) about the oxoacids of the halogens.

AThe reaction $3 HOCl 2 HCl + HClO X_{3}$ is a disproportionation.
BThe acid strength follows $HOCl > HOBr > HOI$ .
C $HOI$ is a stronger acid than $HOCl$ .
D $HClO X_{4}$ is a stronger acid than $HClO X_{3}$ because its anion has more terminal oxygen atoms over which the negative charge is delocalised.

Answer: A, B, D

A: Cl goes from +1 to -1 and +5. B: the more electronegative the halogen, the greater the pull on the O-H bond (

p K_{a}

about 7.5, 8.6, 10.6). C: delocalisation of charge over more O atoms stabilises

ClO X_{4} X^{-}

. D is false, as it reverses B.

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