Trends in p-block hydrides and oxides

2012 AIPMT-MAINS 1 question

1. 1 The p-Block Elements
   In which of the following arrangements the given sequence is not strictly according to the property indicated against it?
   A $CO_2 < SiO_2 < SnO_2 < PbO_2$ : increasing oxidising power B HF < HCl < HBr < HI : increasing acidic strength C $H_2O < H_2S < H_2Se < H_2Te$ : increasing $pK_a$ values D $NH_3 < PH_3 < AsH_3 < SbH_3$ : increasing acidic character
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