NEET2012ChemistryHydrogenActual
In which of the following arrangements the given sequence is not strictly according to the property indicated against it?
Options
- AHF < HCl < HBr < HI : increasing acidic strength
- BH ₂ O < H ₂ ~S < H ₂ Se < H ₂ Te : increasing p K_a values
- CNH ₃ < PH ₃ < AsH ₃ < SbH ₃ : increasing acidic character
- DCO ₂ < SiO ₂ < SnO ₂ < PbO ₂ : increasing oxidising power
Correct answer
B. H ₂ O < H ₂ ~S < H ₂ Se < H ₂ Te : increasing p K_a values
Step-by-step solution
(a,c) As we move from top to bottom in a group, acidic strength of hydrides increases. Therefore, order of acidic strength of hydrides of V A and VII A group elements is aligned & NH ₃ H ₂ ~S > H ₂ Se > H ₂ Te (d) On moving from top to bottom, oxidising power of oxides increases. Thus, order of oxidising power of oxides of IVA group elements is CO ₂ < SiO ₂ < SnO ₂ < PbO ₂