Group 17 Oxoacids Strength
Acid strength of halogen oxoacids HXO3 increases with:
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About This Question
- Subject
- chemistry
- Chapter
- p-block elements
- Topic
- group 17 oxoacids strength
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Increasing electronegativity of X
- Structure of HXO3: These contain an OH group bonded to a central Halogen X which also has terminal Oxygens (=O).
- Inductive Effect: As the electronegativity of X increases (I<Br<Cl), the X atom pulls electron density more strongly away from the O2˘013H bond.
- Proton Release: This weakens the O2˘013H bond and makes it easier for the proton to be released (Ka increases).
- Stabilization: Furthermore, a more electronegative X better stabilizes the negative charge on the resulting oxyanion (XO3−).
- Result: Acidity order: HClO3>HBrO3>HIO3.
This medium difficulty chemistry question is from the chapter p-block elements, covering the topic of group 17 oxoacids strength. It appeared in the 2025 exam.
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