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Thiosulphate reacts differently with iod...

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 ?

A

Bromine is a stronger oxidant than iodine.

B

Bromine is a 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 reactions.

Text Solution

Verified by Experts

The correct Answer is:
A
`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)`.
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Thiosulphate reacts differently with iodine and bromine in the reaction given below 2S_(2)O_(3)^(2-) to S_(4)O_(6)^(2-)+2I^(-) S_(2)O_(3)^(2-)+2Br_(2)+5H_(2)Oto2SO_(4)^(2-)+2Br^(-)+10H^(+) Which of the following statements justifies the above dual behaviour of thiosulphate?

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