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Q.
The oxidation number of $P$ in $H_{2}P_{2}O_{7}$ ion is______.
NTA AbhyasNTA Abhyas 2022
Solution:
In a neutral molecule, the sum of the oxidation numbers of all atoms is zero. Hydrogen has $+1$ oxidation state and oxygen has $-2$ oxidation state. The given compound is pyrophosphoric acid.
$\begin{bmatrix} +1 & x & -2 \\ H_{2} & P_{2} & O_{7} \end{bmatrix}$
$\therefore \left(+1\times 2\right)+\left(2x\right)+\left(-2\times 7\right)=0$
$x=+5$