Thiosulphate reacts differently with iodine and bromine in the reactions given below:
\( 2\mathrm{S_2O_3}^{2-} + \mathrm{I_2} \rightarrow \mathrm{S_4O_6}^{2-} + 2\mathrm{I^-} \)
\( \mathrm{S_2O_3}^{2-} + 5\mathrm{Br_2} + 5\mathrm{H_2O} \rightarrow 2\mathrm{SO_4}^{2-} + 4\mathrm{Br^-} + 10\mathrm{H^+} \)
Which of the following statement justifies the above dual behaviour of thiosulphate?
