Question
In which of the following arrangements, the sequence is not strictly according to the property written against it?
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CO2< SiO2< SnO2< PbO2: increasing oxidising power
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HF< HCl < HBr < HI : increasing acid strength
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NH3< PH3< AsH3< SbH3: increasing basic strength
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B < C < O < N : increasing first ionization enthalpy
Solution
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
