Chemistry - Complete P-block Question with Solution | TestHub

Hypophosphoric acid ${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_6$

The oxidation state of phosphorus is 

$\Rightarrow 4 \times 1 + 2 \times \mathrm{x} + 6 \times \left(-2\right) = 0$

$\Rightarrow 4 + 2\mathrm{x} - 12 = 0$

$\Rightarrow 2\mathrm{x} - 8 = 0$

$\Rightarrow 2\mathrm{x} = 8$

$\Rightarrow \mathrm{x} = \frac{8}{2} = 4$