$A$ substance reacts with dilute $H_2SO_4$ to release a colorless gas which $(i)$ turns baryta water turbid and $(ii)$ turns acidic dichromate solution green. This reaction indicates the presence of which of the following?
- A$CO_3^{2-}$
- B$S^{2-}$
- C$SO_3^{2-}$
- D$NO_2^-$
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