Sign in
12thPass logo
New chatPYQ LibraryDoubtsRank report
Sign in to see Recents

Your guest activity stays on this device

Sign in to save progress →
Sign in

P Block Elements question

2021 · Q126
Guest · filters and generic practice availableBrowsing as a guest · PYQ filters and generic practice are available. Sign in only for personalised features and saved progress.
  1. PYQ Library
  2. /NEET
  3. /Chemistry
  4. /P Block Elements
  5. /2021 · Q126

P Block Elements question

2021 · Q126

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

Correct answer: C

Stronger is the acid, lower is the value of pKa. On moving down the group, bond dissociation enthalpy of hydrides of group 16 elements decreases hence acidity increases and pKa value decreases. Correct order of pKa value will be

H2O > H2S > H2Se > H2Te

PreviousNext

More from P Block Elements

  • Statement I : Acid strength increases in the order given as HF << HCl << HBr << HI. Statement II : As the size of the elements, F, Cl, Br, I increases down the group, the bond strength of HF, HCl, HBr and HI decreases and…2021 · MCQ
  • Identify the correct statements from the following : (A) CO2(g) is used as refrigerant for ice-cream and frozen food. (B) The structure of C60 contains twelve six-carbon rings and twenty five carbon rings. (C) ZSM-5, a type of zeolite, is…2020 · MCQ
  • Which of the following oxoacid of sulphur has − O− O− linkage?2020 · MCQ
  • Which of the following is not correct about carbon monoxide?2020 · MCQ
  • Match the following and identify the correct option. Includes table2020 · MCQ
  • Which of the following is incorrect statement?2019 · MCQ
  • Which of the following species is not stable?2019 · MCQ
  • Identify the incorrect statement related to PCl5 from the following :2019 · MCQ