Which of the following observations with lead nitrate solution are correct?

A $Na X_{2} S$ gives a white precipitate of $PbS$
B $Na X_{2} SO X_{4}$ gives white $PbSO X_{4}$ soluble in hot ammonium acetate
CConcentrated $NaCl$ gives white $PbCl X_{2}$ that dissolves in hot water
D $KI$ gives bright yellow $PbI X_{2}$ that dissolves on heating and reappears as golden spangles on cooling

Answer: B, C, D

PbCl X_{2}

is sparingly soluble in cold but soluble in hot water, and

PbI X_{2}

crystallises as golden spangles.

PbSO X_{4}

dissolves in ammonium acetate through formation of a lead acetate complex.

PbS

is black, not white.