Relative order of acidity of HF, HCl, HBr and HI acids is
Correct answer: C. HI > HBr > HCl > HF
- A. HCl > HBr > HI > HF
- B. HF > HCl > HBr > HI
- C. HI > HBr > HCl > HF
- D. HF > HI > HCl > HBr
Explanation
The correct order of acidity for the halogen acids is HI > HBr > HCl > HF. This trend is due to the decreasing bond strength between the hydrogen and halogen atoms down the group. As you move down the group in the periodic table, the size of the halogen atoms increases, which leads to weaker H-X bonds and thus greater acidity. HF is an exception because of its strong hydrogen bonding, which makes it less acidic compared to the other halogen acids despite having a stronger H-F bond.
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Acid and base behaviour is explained through the Bronsted-Lowry transfer of protons and the Lewis donation or acceptance of electron pairs. The topic includes pH, pOH, ionisation and water equilibrium, plus salt formation and hydrolysis, where a salt solution may become acidic, basic or neutral.
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