JEE Advanced Chemistry question

Consider the following compounds I. Na2S2O3 II. Na2S4O6 III. CaOCl2 Among these compounds identify those that have different oxidation states for same type of atom

(A)I and III
(B)II and III
(C)I and II
(D)I, II and IIICorrect

Answer: (D)

Solution

In Na2S2O3 (thiosulphate), the two sulphur atoms are not equivalent — one (central) sulphur is in the +5/+6-like environment of a sulphate-type S, while the other (terminal) sulphur, formally substituting an oxygen, is in a much lower (−1/−2-like) state — so sulphur shows two different oxidation states in compound I.

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Question ID VK-159340