Question

In ${\text{TeO}}_{3(aq)}^{2-}\to {\text{TeO}}_{4(aq)}^{2-},$ Find the change in oxidation state of $Te$ ?

Answer 1

Answer: 2

The oxidation number of $Te$ increases from $+4$ to $+6.$ Hence, oxidation number of $Te$ changes by $2$ units.