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Q.

Sodium thiosulphate reacts with iodine to give iodide and tetrathionate. In this reaction S2O32– undergoes

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a

Oxidation

b

Reduction

c

Disproportionation

d

Comproportionation

answer is A.

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Detailed Solution

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large mathop {2{S_2}}limits^{ + 2} O_3^{ - 2}; + ;{I_2}; to ;mathop {{S_4}}limits^{ + 2.5} O_6^{ - 2}; + ;2{I^ - }

Oxidation state of 'S' in S2O3-2  increase from +2 to +2.5
∴ S2O3-2 undergoes Oxidation.

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Sodium thiosulphate reacts with iodine to give iodide and tetrathionate. In this reaction S2O32– undergoes