Identify the oxidant and reduction in the following reactions. (a) Zn(s) +1/2 O_2(g)rarrZnO(s) (b) CH_4(g) + 4Cl_2(g) rarr "CCl"_4(g) + 4HCl(g) (c) I_2(aq) +2S_2O_3^(2-)(aq)rarr2I^(-) (aq)+S_4O_6^(2-)(aq) (d) Zn(s)+2H^(+)(aq) rarr Zn^(2+) +(aq) +H_2(g)

Identify the oxidant and reduction in the following reactions. (a) Zn

1.	Identify the oxidant and reduction in the following reactions. (a) Zn(s) +1/2 O_2(g)rarrZnO(s) (b) CH_4(g) + 4Cl_2(g) rarr "CCl"_4(g) + 4HCl(g) (c) I_2(aq) +2S_2O_3^(2-)(aq)rarr2I^(-) (aq)+S_4O_6^(2-)(aq) (d) Zn(s)+2H^(+)(aq) rarr Zn^(2+) +(aq) +H_2(g)
Answer» Solution :(a) `Zn(s) +1/2O_2(G) rarr ZnO(s)` In this reaction, ZINC donates electrons to O to give zinc ions and oxide ions. Thus, Zn acts as reluctant while oxygen acts as OXIDANT. (b) `CH_4(g)+4Cl_2(g)rarr"CCl"_4 (g) + 4HCl(g) CH_4` is oxidised and acts as reluctant while `Cl_2` is reduced and acts as oxidant. (c) `I_2(aq)+2S_2O_3^(2-)(aq) rarr 2I^(-)(aq) +S_4O_6^(2-)(aq)` `I_2` gains electrons and is reduced . Therefore , it acts as oxidant. `S_2O_3^(2-)` acts as reluctant. (d) `Zn(s)+2H^(+)(aq) rarr Zn^(2+) (aq) +H_2(g)` Zinc loses electrons and gets oxidised . Therefore , it acts as reluctant . Hydrogen gets reduced and acts as an oxidant.