In the reaction, \[ 2 \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}+\mathrm{I}_{2} \longrightar...
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0In the reaction,
\[
2 \mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}+\mathrm{I}_{2} \longrightarrow \mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{6}+2 \mathrm{NaI} \text {, }
\]
the oxidation state of sulphur is:
(A) decreased
(B) increased
(C) unchanged
(D) none of these
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