STANDARDChemistry-Periodic Properties
STANDARD Chemistry Trends in Chemical Properties MCQ Question
Type: MCQ-conceptual-Medium
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?
A
CO₂ < SiO₂ < SnO₂ < PbO₂ : Increasing oxidizing power
B
HF < HCl < HBr < HI : Increasing acidic strength
C
H₂O < H₂S < H₂Se < H₂Te : Increasing pKₐ values
D
NH₃ < PH₃ < AsH₃ < SbH₃ : Increasing acidic character
Correct Answer
Option C
Detailed Explanation
The pKₐ values decrease as the acidic strength increases. Therefore, the correct order should be H₂O > H₂S > H₂Se > H₂Te.
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