Select the strongest and weakest acid in each of the following sets:
a. `HBr,HF,H_(2)Te,H_(2)Se, PH_(3),H_(2)O`
b. `HClO, HIO, H_(3)PO_(3),H_(2)SO_(3),H_(2)AsO_(3)`

Explanation

`HBr`, a strong acid, is the strongest in the given set. `PH_(3)`, which has weakly is farthest to the right in the periodic table and has the most oxygen atoms, is the most acidic.
`HCIO`, with the fewest oxygen atoms and the farthest up in the periodic table,is the weakest.