Chemistry - Complete Pblock- Question with Solution | TestHub

H₂O₂ (Option A): Oxygen has an intermediate oxidation state of $-1$, so it can be reduced to $-2$ (H₂O) or oxidized to $0$ (O₂).

Cl₂ (Option B): Chlorine has an intermediate oxidation state of $0$, which allows it to be reduced to $-1$ (Cl⁻) or oxidized to positive states (like $+1,+5,+7$).

KMnO₄ and K₂Cr₂O₇ (Options C, D): Mn ($+7$) and Cr ($+6$) are already in their maximum possible oxidation states, meaning they can only decrease (be reduced) and act strictly as oxidizing agents.