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Thiosulphate reacts differently with iodine and bromine in the reactions given below.2 S2O32-+I2⟶S4O62-+2I-S2O32-+2Br2+5H2O⟶2SO42-+2Br-+10H+Which of the following statements justifies the above dual behavior of thiosulphate?

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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

answer is A.

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Detailed Solution

2 S2O32-(aq)+I20(s)⟶S4O62-(aq)+2I-(aq)S2+2O32-(aq)+2Br2(l)+5H2O(l)⟶2 SO42-(aq)+4Br-(aq)+10H+(aq)Bromine being stronger oxidising agent than iodine, oxidises S (in +2 oxidation state) of S2O32 ion to S (in + 6 oxidation state) SO42- ion, whereas I2 oxidises S from +2 oxidation state of S2O32- to only +2.5 oxidation state of S4O62- ion.

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