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A gas is obtained by addition of dil. `H_(2)SO_(4)` to a mixture which turns lead acetate paper black. It is
A. `H_(2)S` gas
B. `NO_(2)`
C. `CO_(2)`
D. `SO_(2)`

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`Pb(CH_(3)COO)_(2)+H_(2)Sunderset(("black ppt"))(PbS)+2CH_(3)COOH`

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