$A$ substance reacts with dilute $H_2SO_4$ to release a colorless gas,which turns baryta water $[Ba(OH)_2]$ turbid and decolorizes an acidic solution of dichromate. The presence of which of the following is indicated by this reaction?
- A$CO_3^{2-}$
- B$S^{2-}$
- C$SO_3^{2-}$
- D$NO_2^-$
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