1.

A white crystalline substance dissolves in water. On passing H_(2)S in this solution, a black precipitate is obtained. The black drops of conc. H_(2)SO_(4) a white precipitate is obtained. This precipitate is that of

Answer»

`BaSO_(4)`
`SrSO_(4)`
`PbSO_(4)`
`CdSO_(4)`

Solution :`PB^(+2)+H_(2)S underset(acidic)tounderset(("black ppt."))(PBS)darr+H_(2)uarr`
`3PbS+8HNO_(3)to3Pb(NO_(3))_(2)+2NO+3S+4H_(2)O`
`Pb(NO_(3))_(2)+H_(2)SO_(4)to underset(("white ppt."))(PbSO_(4))darr+2HNO_(3)uarr`


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