In which of the following arrangements- the given sequence is not strictly according to the property indicated against it-CO-2- Si-O-2- Sn-O-2- Pb-O-2- increasing oxidising powerHF- HCl- HBr- HI- increasing acidic strength-NH-3- -PH-3- As-H-3- Sb-H-3- increasing acidic character-H-2-O- -H-2-S-H-2-Se-H-2-Te- increasing p-K-a- values

Question

Toppr Admin · Accepted Answer

The following sequence is not strictly according to the property indicated against it.
$H_{2} O < H_{2} S < H_{2} S e < H_{2} T e$ ; increasing $p K_{a}$ values.

Th correct sequence is:
$H_{2} O > H_{2} S > H_{2} S e > H_{2} T e$ ; decreasing $p K_{a}$ values.

In Hydrides, as we move top to bottom, acidic nature increases so with the increase in the acidity from top to bottom, the $K_{a}$ value increases and $p K_{a}$ value decreases.

In which of the following arrangements, the given sequence is not strictly according to the property indicated against it?CO2<SiO2<SnO2<PbO2; increasing oxidising powerHF<HCl<HBr<HI; increasing acidic strengthNH3<PH3<AsH3<SbH3; increasing acidic characterH2O<H2S<H2Se<H2Te; increasing pKa values