1.

In which of the following arrangements, the given sequence is not strictly according to the property indicated against it ?A. `HF lt HCl lt HBr lt HI` : increasing acidie strengthB. `H_(2)O lt H_(2)S lt H_(2)Se lt H_(2)Te`: increasing `pK_(a)` valuesC. `NH_(3) lt PH_(3) lt AsH_(3) lt SbH_(3)` : increasing acidic characterD. `CO_(2) lt SiO_(2) lt SnO_(2) lt PbO_(2)` : increasing oxidising power

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


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