A) \[C{{O}_{2}}<Si{{O}_{2}}<Sn{{O}_{2}}<Pb{{O}_{2}}\]: increasing oxidising power
B) \[N{{H}_{3}}<P{{H}_{3}}<As{{H}_{3}}<Sb{{H}_{3}}\]: increasing basic strength
C) \[HF < HCl < HBr < HI\]: increasing acid strength
D) \[B<C<O<N\]: increasing first ionization enthalpy.
Correct Answer: B
Solution :
Correct order of increasing basic strength is \[N{{H}_{3}}>P{{H}_{3}}>As{{H}_{3}}>Sb{{H}_{3}}>Bi{{H}_{3}}\]
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