Question

Solve please tommorrow is my exam....
Solve question 4.​

Answer 1

1:--

     HPO₃⁻²

oxidation state of hydrogen =1

oxygen=-2

phosphorus=x

so,

        HPO₃⁻²

  { 1 }× {x }× 3×{-2}= -2

   1+x-6=-2

   x=3

so oxidation state is 3.

similarly in 2, for

  PO₄⁻³

x-8=-3

x=5

so oxidation state is 5