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a
H2S2O3
b
N2S2O6
c
H2S2O8
d
H2S4O6
answer is C.
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Detailed Solution
When the oxidation number of the central atoms exceeds the maximum and the surrounding oxygen atoms are in even number, then both the central atoms are connected by peroxy-linkage.Following is the structure of peroxy-disulfuric acid or Marshall's acid.