The acidic strength of hydrides in Group 17 follows the order . Why does acidic strength increase do — Periodic Table and Periodicity Chemistry Question
Question
The acidic strength of hydrides in Group 17 follows the order $HF < HCl < HBr < HI$. Why does acidic strength increase down the group despite a decrease in electronegativity?
Answer: B
💡 Solution & Explanation
While high electronegativity favors acidity across a period, down a group, the increasing atomic radius causes the $H-X$ bond length to increase. The weaker bond easily releases an $H^+$ ion, dominating the acidity trend.
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