Chemistry - Redox Reactions Question with Solution | TestHub

A species can be both oxidized and reduced if it contains an element in an intermediate oxidation state (or both an oxidizable and a reducible part). HCl: Cl⁻ (-1) can be oxidized to Cl₂ and H⁺ can be reduced to H₂. HClO (Cl = +1) and HClO₃ (Cl = +5) have chlorine in intermediate states, so each can be oxidized (to higher oxoacids) or reduced (to Cl₂/Cl⁻). In HClO₄, chlorine is at its maximum +7 and H⁺ alone makes it only reducible in practice. Hence (a), (b), (c).