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In which of the following arrangements, the sequence is not st | ᅠ

In which of the following arrangements, the sequence is not strictly according to the property written against it ?
AIEEE 2009
Anonymous Quiz
16%
(a) CO2 < SiO2 < SnO2 < PbO2 : increasing oxidising power
31%
(b) HF < HCl < HBr < HI : increasing acid strength
37%
(c) NH3 < PH3 < AsH3 < SbH3 : increasing basic strength
15%
(d) B < C < O < N : increasing first ionization enthalpy
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