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A white crystalline substance dissolves ...

A white crystalline substance dissolves in water. On passing `H_2 S` in this solution, a black ppt. is obtained. The black ppt. dissolves completely in hot `HNO_3`. On adding few drops of conc. `H_2 SO_4`, a white ppt. is obtained. The ppt. is that of

A

`BaSO_(4)`

B

`SrSO_(4)`

C

`PbSO_(4)`

D

`CdSO_(4)`

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