The oxidation number of phosphorus in is
- A.+3
- B.+2
- C.+1
- D.-1
Show answer and solution
Correct option: C
Solution
Ba is +2, each H₂PO₂⁻ anion has charge −1. In H₂PO₂⁻: oxygen is −2 (×2 = −4), hydrogen is +1 (×2 = +2). So P + 2(+1) + 2(−2) = −1, giving P + 2 − 4 = −1, thus P = +1.
[1988]