Which of the following statements justifies the dual behaviour of atmosphere after learning the reactions ?
`2S_(2)O_(3)^(2-)+I_(2) too S_(4)O_(6)^(2-)+2I^(-)`
`S_(2)O_(3)^(2-)+2Br+5H_(2)O to 2SO_(4)^(2-)+2Br^(-)+10H^(+)`

Options

A. bromine is stronger oxidant than iodine
B. bromine is weaker oxidant than iodine
C. thiosulphate undergoes oxidation by bromine and reduction by iodine in these reactions
D. bromine undergoes oxidation and iodine undergoes reduction in these reaction

Answer

A

Explanation

`2S_(2)O_(3)^(2-) " " S_(2)O_(3)^(2-) to SO_(4)^(2-)`
`S^(2+) to S^(5+) + 3e^(-) " " S^(2+) to S^(3+) + e^(-)`