The correct option is(D): - 2 and - 1.
The reaction involved is \(BaO_2 + H_2SO_4 \rightarrow BaSO_4 + H_2O_2\) The most electronegative atom, oxygen, in \(BaSO_4\) and
\(H_2O_2\) has - 2 and - 1 oxidation state respectively.
Which of the following has the highest hydration energy?