Thiosulphate reacts differently with iodine and bromine in the reactions given below : S_(2)O_(3)^(2-)+I_(2) rarr S_(4)O_(6)^(2-) + 2I^(-) S_(2)O_(3)^(2-)+2Br_(2)+5H_(2)O rarr 2SO_(4)^(2-)+2Br^(-)+10H^(+) Which of the following statements justifies the above dual behaviour of thiosulphate ?

Thiosulphate reacts differently with iodine and bromine in the reactio

1.	Thiosulphate reacts differently with iodine and bromine in the reactions given below : S_(2)O_(3)^(2-)+I_(2) rarr S_(4)O_(6)^(2-) + 2I^(-) S_(2)O_(3)^(2-)+2Br_(2)+5H_(2)O rarr 2SO_(4)^(2-)+2Br^(-)+10H^(+) Which of the following statements justifies the above dual behaviour of thiosulphate ?
Answer» Bromine is a STRONGER oxidant than iodine.<BR>Bromine is a weaker oxidant than iodine. Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reactions. Bromine undergoes oxidation and iodineundergoes reduction in these reactions. Solution :`Br_(2)` OXIDISES S to a higher oxidation state (i.e., `OVERSET(+2)S_(2)O_(3)^(2-)rarr overset(+6)SO_(4)^(2-)`) and `I_(2)` oxidises S to a lower oxidation state (i.e., `overset(+2)S_(2)O_(3)^(2-)rarr overset(+2.5)S_(4)O_(6)^(2-)`). Thus, `Br_(2)` is stronger oxidising agent than `I_(2)`.