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In which of the following arrangements the given sequence is not strictly according to the property indicated against it?

1. HF < HCl < HBr < HI : increasing acidic strength
2. H2O < H2S < H2Se < H2Te : increasing pKa values
3. NH3 < PH3 < AsH3 < SbH3 : increasing acidic character
4. CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power

Correct answer: H2O < H2S < H2Se < H2Te : increasing pKa values

Solution

Option B is incorrect because the pKa values decrease (not increase) as we move from H2O to H2Te, indicating increasing acidity, not increasing pKa values.

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