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a
there is only one replaceable hydrogen atom.
b
one S atom is in +2 and other sulphur atom is in +4 oxidation state.
c
there is a S=S linkage present.
d
each Sulphur atom is in identical oxidation state.
answer is C.
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Detailed Solution
Thiosulphuric acid (H2S2O3)(a) Two replaceable H-atoms(b) One s-atom is in -4 and another S-atom is in zero O.S.(c) (S =S) linkage is present(d) Each S-atom is in different O.S.