Aqueous solution of a salt $(A)$ forms a dense white precipitate with $BaCl_{2}$ solution. The precipitate dissolves in dilute $HCl$ to produce a gas $(B)$ which decolourises acidified $KMnO_{4}$ solution. $A$ and $B$ respectively are
- A$Na_{2}SO_{3}, SO_{2}$
- B$Na_{2}SO_{4}, H_{2}S$
- C$Na_{2}SO_{3}, H_{2}S$
- D$Na_{2}SO_{4}, SO_{2}$
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