Sodium sulphite `(Na_(2)SO_(3))` is added to meat as a preservative. The presence of `Na_(2)SO_(4)` can be detected by adding dil. `H_(2)SO_(4)` when the pungent smelling gas evolved turns the lime water milky. The gas evolved was detected as sulphur dioxide. The `SO_(2) " to "SO_(4)^(2-)` in titration.
`SO_(2)+2H_(2)O+I_(2) to 4H^(+)+SO_(4)^(2-)+2I^(-)`
In order to check the results of titration, excess barium chloride is added to the final solution. The resulting precipitate is collected and weighed.
Q. Which of the following compounds is formed, when `Na_(2)SO_(3)` is boiled with sulphur.

Options

A. `Na_(2)SO_(4)`
B. `Na_(2)S_(4)O_(5)`
C. `Na_(2)S_(4)O_(6)`
D. `Na_(2)S_(4)O_(3)`

Answer

D