In which of the following arrangements the given sequence is not strict according to the property indicated against it?

Options

A. `HF lt HCl lt HBr lt HI` : increasing acidie strength
B. `H_(2)O lt H_(2)S lt H_(2)Se lt H_(2)Te`: increasing `pK_(a)` values
C. `NH_(3) lt PH_(3) lt AsH_(3) lt SbH_(3)` : increasing acidic character
D. `CO_(2) lt SiO_(2) lt SnO_(2) lt PbO_(2)` : increasing oxidising power

Answer

B

Explanation

Acidity increases or `pK_(a)` the `H-M` bond strength decreases from O to Te. Thus, option (b) is not correct.