Which of the following is correctly matched?
- A$NaCl + \text{dil. } H_2SO_4 : \text{Red vapours}$
- B$NaCl + AgNO_3 : \text{White ppt.}$
- C$CO_3^{2-} \xrightarrow{\text{dil. } H_2SO_4} : CO \text{ gas}$
- D$SO_3^{2-} \xrightarrow{\text{dil. } H_2SO_4} : \text{Brown gas}$
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