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P Block Elements question

2012 · Q64
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P Block Elements question

2012 · Q64

NEETChemistryP Block ElementsMCQ+4 / −1
In which of the following arrangements the given sequence is not strictly according to the property indicated against it?
  1. A
    HF < HCl < HBr < HI : increasing acidic strength
  2. B
    H2O < H2S < H2Se < H2Te : increasing pKa values
  3. C
    NH3 < PH3 < AsH3 < SbH3 : increasing acidic character
  4. D
    CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power
View written solutionFree

Correct answer: B

If acidic nature is high, Ka is high and pKa is low.

since pKa = – log Ka

Hence the order of pKa will be

H2O > H2S > H2Se > H2Te

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