Chemistry - Redox Reactions Question with Solution | TestHub

Let the oxidation state of phosphorus be $x$.

The oxidation state of magnesium is $+2$ and oxygen is $-2$.

In ${\text{Mg}}_2{\text{P}}_2{\text{O}}_7$, the sum of oxidation states of all atoms is zero.

$2(+2)+2(x)+7(-2)=0$

$4+2x-14=0$

$2x-10=0$

$2x=10$

$x=+5$

Answer: $+5$