The P Block Elements - Result Question 67

####70. In which of the following arrangements the given sequence is not strictly according to the property indicated against it?

[2012 M]

(a) HF<HCl<HBr<HI : increasing acidic strength

(b) H2O<H2S<H2Se<H2Te : increasing pKa values

(c) NH3<PH3<AsH3<SbH3 : increasing acidic character

(d) CO2<SiO2<SnO2<PbO2 : increasing oxidising power

Show Answer

Solution:

  1. (b) If acidic nature is high, Ka is high and pKa is low

Unknown environment 'tabular'

Hence the order of pKa will be

H2O>H2S>H2Se>H2Te

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