Question

Some examples of redox reaction are given. Identify the reductants and oxidants from them.
`2H_(2) S+ SO_(2) to 3Sdarr +2H_(2)O`

Answer 1

(i) In a redoxx reaction, the reductant transfers electrons to the oxidant.
(ii) Then in the reaction, the reductant or reducing agent loses electrons and is oxidised and the oxidant or oxidizing agent gains electrons and is reduced.
(iii) `therefore` Hence, in the above equation, reductant is `SO_(2)` and oxidant, is `H_(2)S`
`MnO_(2)+4HCl to HnCl_(2) +2H_(2) O +Cl_(2)uarr`
(i) Reductant: `MnO_(2)^(-)` as it loses oxygen.
(ii) Oxidant: HCl - as it gains oxygen.