When iodine is passed through sodium thiosulphate, it is decolorized and sodium tetrathionate is...

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When iodine is passed through sodium thiosulphate, it is decolorized and sodium tetrathionate is formed. What is the change in the oxidation number of a sulphur atom in the reaction?
(A) \( 1 / 2 \)
(B) \( 3 / 2 \)
(C) 2
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