In which of the following arrangements the given sequence is not strict according to the property indicated against it?A. `HF lt HCI lt HBr lt HI` : increasing acidic 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.

In which of the following arrangements the given sequence is not stric

1.	In which of the following arrangements the given sequence is not strict according to the property indicated against it?A. `HF lt HCI lt HBr lt HI` : increasing acidic 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 The acidic strength of hydrides in group 16 elements increases with the increase the size of the element. This means that `pK_(a)` is to be in decreasing order. The increasing `pK_(a)` order is the reverse `H_(2)Te lt H_(2)Se lt H_(2)S lt H_(2)O`.

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