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A salt on treatment with dil. HCl gives a pungent smelling gas and a yellow precipitate. The salt gives green flame when tested. The solution gives a yellow ppt. with potassium chromate. The salt is
A. `NiSO_(4)`
B. `BaS_(2)O_(3)`
C. `PbS_(2)O_(3)`
D. `CuSO_(4)`

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`BaS_(2)O_(3)` gives out `SO_(3)` gas along the with colloidal sulphur on reaction with dil. `H_(2)SO_(4). Ba^(2+)` gives green flame and forms yellow ppt. with potassium chromate.

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