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Q.

Thiosulphate reacts differently with iodine and bromine in the reactions given below
2S2O32+I2S4O62+2IS2O32+2Br2+5H2O2SO42+2Br+10H+
Which of the following statements in correct ?

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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

Iodine oxidizes S2O32- to S4O62- in which, S has low oxidation state +2.5, but bromine oxidizes S2O32- to SO42- in which, sulphur has higher oxidation state +6. So, Bromine oxidizes more and therefore, it is stronger oxidizng agent than iodine.

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