AIPMT MAINS 2012 Chemistry Acidic Strength MCQ Question
In which of the following arrangements the given sequence is not strictly according to the property indicated against it?
HF < HCl < HBr < HI : increasing acidic strength
H₂O < H₂S < H₂Se < H₂Te : increasing pKₐ values
NH₃ < PH₃ < AsH₃ < SbH₃ : increasing acidic character
CO₂ < SiO₂ < SnO₂ < PbO₂ : increasing oxidising power
Correct Answer
Detailed Explanation
If acidic nature is high, Kₐ is high and pKₐ is low. The correct order for acidic nature is H₂O < H₂S < H₂Se < H₂Te, but for pKₐ it should be H₂O > H₂S > H₂Se > H₂Te.
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