Q38. Thiosulphate reacts differently with iodine and bromine in the reactions given below:\\
$2 \mathrm {~S} _ { 2 } \mathrm { O } _ { 3 } ^ { 2 - } + \mathrm { I } _ { 2 } \rightarrow \mathrm {~S} _ { 4 } \mathrm { O } _ { 6 } ^ { 2 - } + 2 \mathrm { I } ^ { - }$\\
$\mathrm { S } _ { 2 } \mathrm { O } _ { 3 } ^ { 2 - } + 5 \mathrm { Br } _ { 2 } + 5 \mathrm { H } _ { 2 } \mathrm { O } \rightarrow 2 \mathrm { SO } _ { 4 } ^ { 2 - } + 4 \mathrm { Br } ^ { - } + 10 \mathrm { H } ^ { + }$\\
Which of the following statement justifies the above dual behaviour of thiosulphate?\\
(1) Bromine is a stronger oxidant than iodine\\
(2) Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reaction\\
(3) Bromine is a weaker oxidant than iodine\\
(4) Bromine undergoes oxidation and iodine undergoes reduction in these reactions