The oxidation number of phosphorus in is: — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

Barium is $+2$, so the $H_2PO_2$ group has a charge of $-1$. In $H_2PO_2^-: 2(+1) + x + 2(-2) = -1 \Rightarrow 2 + x - 4 = -1 \Rightarrow x = +1$. [1, 3]