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White precipitate of `PbSO_(4)` gets dissolved in:
A. concentrated `H_(2)SO_(4)` on heating
B. concentrated `NaOH`
C. `(NH_(4))_(2)CO_(3)`
D. Dilute `HNO_(3)`

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Correct Answer - A,B
(A)`PbSO_(4)darr +H_(2)SO_(4)` (hot and concentrated) `to Pb^(2+)+2HSO_(4)^(-)`(soluble)
(B)It dissolves forming `Na_(2)[Pb (OH)_(4)]` soluble complex.

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