Chemistry - Complete Pblock- Question with Solution | TestHub

Orthophosphoric acid (A) has the chemical formula H₃PO₄. The oxidation state of P in H₃PO₄ is calculated as: $3(+1)+x+4(-2)=0⟹x=+5$.

Metaphosphoric acid (C) has the chemical formula HPO₃. The oxidation state of P in HPO₃ is calculated as: $1(+1)+x+3(-2)=0⟹x=+5$.

The difference between the oxidation states is: $+5-(+5)=0$.

Therefore, the correct option is (A).