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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
