Verified Solution • 2025–26 Session
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QNEET-2021-Ch-581: NEET 2021 Chemistry - Class 12 NEET-2021-Ch-581 Solution: In which one of the following arrangements the given sequence…
In which one of the following arrangements the given sequence is not strictly according to the properties indicted against it? : Increasing oxidizing order : Increasing acidic strength : Increasing pKa values : Increasing acidic character
Multiple Choice Options
- A CO 2 < SiO 2 < SnO 2 < PbO 2 : Increasing oxidizing order
- B HF < HCl < HBr < HI : Increasing acidic strength
- C H 2 O < H 2 S < H 2 Se < H 2 Te : Increasing pK a values
- D NH 3 < PH 3 < AsH 3 < SbH 3 : Increasing acidic character
Step-by-Step Verified Solution
Stronger is the acid, lower is the value of pK a . On moving down the group, bond dissociation enthalpy of hydrides of group 16 elements decreases hence acidity increases and pK a value decreases. Correct order of pK a value will be
H 2 O > H 2 S > H 2 Se > H 2 Te