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 power
HF<HCl<HBr<HI; increasing acidic strength
NH3<PH3<AsH3<SbH3; increasing acidic character
H2O<H2S<H2Se<H2Te; increasing pKa values
A
CO2<SiO2<SnO2<PbO2; increasing oxidising power
B
H2O<H2S<H2Se<H2Te; increasing pKa values
C
NH3<PH3<AsH3<SbH3; increasing acidic character
D
HF<HCl<HBr<HI; increasing acidic strength
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Solution
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The following sequence is not strictly according to the property indicated against it. H2O<H2S<H2Se<H2Te; increasing pKa values.
Th correct sequence is: H2O>H2S>H2Se>H2Te; decreasing pKa values.
In Hydrides, as we move top to bottom, acidic nature increases so with the increase in the acidity from top to bottom, the Ka value increases and pKa value decreases.
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