The p-Block Elements (Group 15 to 18)Groups 15, 16 and 17 – Trends in Hydrides and Oxides 1 2021 Hard
In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?
A $H_2O<H_2S<H_2Se<H_2Te$ : Increasing $pK_a$ values
B $NH_3<PH_3<AsH_3<SbH_3$ : Increasing acidic character
C $CO_2<SiO_2<SnO_2<PbO_2$ : Increasing oxidising power
D $HF<HCl<HBr<HI$ : Increasing acidic strength