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

JEE Main levelSingle correct optionDifficulty 2 of 3ph021

The correct order of increasing reducing power of the hydrogen halides is

A $HF < HCl < HI < HBr$
B $HI < HBr < HCl < HF$
C $HCl < HF < HBr < HI$
D $HF < HCl < HBr < HI$

Answer: D

Reducing power depends on how easily

X X^{-}

loses an electron. The H-X bond weakens and

X X^{-}

becomes larger down the group, so

HI

is the strongest reducing agent and

HF

the weakest.

Practice p-Block Elements: Groups 17 and 18 More on Halogen compounds: HX, oxoacids, bleaching powder

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