$X + H_2SO_4 \to Y$ (colorless gas) and $Y + K_2Cr_2O_7 + H_2SO_4 \to$ green solution. Then $X$ and $Y$ are respectively ........
- A$SO_3^{2-} , SO_2$
- B$Cl^{-} , HCl$
- C$S^{2-} , H_2S$
- D$CO_3^{2-} , CO_2$
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