question_answer

                Identify the oxidants and reductants in the following reactions (a)\[C{{H}_{4}}(g)+4C{{l}_{2}}(g)\xrightarrow{\,}\,CC{{l}_{4}}(g)+4HCl\,(g)\] (b)\[2{{H}^{+}}\,(aq)+Mn{{O}_{2}}\,(s)+{{C}_{2}}{{H}_{2}}{{O}_{4}}\,(aq)\xrightarrow{{}}M{{n}^{2+}}\,(aq)+2C{{O}_{2}}\,(g)+2{{H}_{2}}O\,(l)\] (c) \[{{I}_{2}}(aq)+2{{S}_{2}}{{O}_{3}}^{2-}\,(aq)\xrightarrow{\,}2{{I}^{-}}(aq)\]\[+{{S}_{4}}{{O}_{6}}^{2-}(aq)\] (d)\[C{{l}_{2}}(g)+2\,B{{r}^{-}}\,(aq)\xrightarrow{{}}2C{{l}^{-}}\,(aq)+B{{r}_{2}}\,(aq)\]

Answer:

                (a) Let us write the oxidation numbers of all the atoms of the reactants and products taking part in the reaction. \[C{{H}_{4}}\] is reductant (reducing agent) and \[C{{l}_{2}}\] is oxidant (oxidising agent).                 (b) Let us write the oxidation numbers of all the atoms of the reactants and products taking part in the reaction. \[{{C}_{2}}{{H}_{2}}{{O}_{4}}\]is reductant (reducing agent) and \[Mn{{O}_{2}}\] is oxidant (oxidising agent). (c) Let us write the oxidation numbers of all the atoms of the reactants and products taking part in the reaction. \[{{S}_{2}}{{O}_{3}}^{2-}\] is reductant (reducing agent) and \[{{I}_{2}}\] is oxidant (oxidising agent). (d) Let us write the oxidation numbers of atoms of all the reactants and products taking part in the reaction. \[B{{r}^{-}}\] is reductant (reducing agent) and \[C{{I}_{2}}\] is oxidant (oxidising agent).