Answer :

(a) Oxoacids are those acids which contains oxygen. Phosphorus forms many oxoacids, such as hypophosphoric acid(H3PO4), orthophosphoric acid(H3PO5),hypophosphorus acid (H3PO2),phosphorous acid(H3PO3) etc.

(b) Bromine being a part of group 17 contains 7 electrons in its outermost shell. In BrF5, the five electron is bounded with F, and remaining 2 are present as 1 lone pair. So the molecule geometry of BrF5 will be square pyramidal.

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