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Q 2670223116.     Identify A to D in the following sequence of reactions. Also give the oxidation state of sulphur in all these compounds.
`Na_2CO_3 overset (SO_2) (->) A overset (Na_2CO_3) (->) B overset text(Elemental S) (->) C overset (I_2) (->) D`
JEE 2003 Mains
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