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The p-Block Elements
Question
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In which of the following arrangements, the sequence is not strictly according to the property written against it? 

  • CO2< SiO2< SnO2< PbO2: increasing oxidising power

  • HF< HCl < HBr < HI : increasing acid strength

  • NH3< PH3< AsH3< SbH3: increasing basic strength

  • B < C < O < N : increasing first ionization enthalpy

Answer

C.

NH3< PH3< AsH3< SbH3: increasing basic strength

As the size of the central non-metal increasing appreciably, the basicity of hydride decreases.
NH3< PH3< AsH3< SbH3

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