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Aqueous solution of a salt (A) forms a ...

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

`BaSO_(3) , H_(2)S`

B

`BaSO_(4) , SO_(2)`

C

`BaSO_(3),SO_(2)`

D

`BaSO_(4),H_(2)S`

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