Oxidation number of `P` in `Ba(H_(2)PO_(2))_(2)` is

Answer

A

Explanation

`Ba(H_(2)(PO_(2))_(2) to Ba^(2+) + 2H_(2)PO_(2)^(-)`
for `H_(2)PO_(2)^(-) implies +2 +x -4=-1 implies x=+1`