In which of the following reagents, the white precipitate fo `PbSO_(4)` is solutble ?
dilute HCl, hot concentrated `H_(2)SO_(4)`, ammonium acetate (6M), ammonium tartrate 6M in the presence of ammonia, sodium hydroxide solution.

Explanation

Not in dilute HCl but dissolves in all other reagents.
`PbSO_(4) darr +H_(2)SO_(4) to Pb^(2+) +2HSO_(4)^(-), PbSO_(4) darr + 4 CH_(3)CO O^(-) to [Bp(CH_(3)CO O)_(4)]^(2-)+SO_(4)^(2-)`
`PbSO_(4) darr +2 C_(6)H_(4)O_(6)^(2-) to [Pb(C_(6)H_(4)O_(6))_(2)]^(2-)+SO_(4)^(2-)`
`PbSO_(4) darr + 4 OH^(-) to [Pb (OH)_(4)]^(2-) +SO_(4)^(2-)`