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MEDIUMMCQ SINGLEJEE Advanced ChemistryInorganic Chemistryp -Block Elements (group 15-18)Previous Year Questions

In which on of the following arrangements the given sequence is not strictly according to the properties Indicated against it? (NEET 2021)

A.CO₂<SIO₂<SnO₂<PbO₂ :
B.HF<HCl<HBr<HI
C.H₂O<H₂S<H₂Se<H₂Te : Increasing pKa values✓ Correct
D.NH₃<PH₃<AsH₃<SbH₃ :Increasing acidic character
Explanation

Oxidising power : CO₂ < SiO₂ < SnO₂ < PbO₂ Acidic strength : HF<HCl<HBr<HI pKa : H₂O<H₂S<H₂Se<H₂Te Acidic strength : 1 pKa Acidic strength : NH₃<PH₃<AsH₃<SbH₃

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