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CGP EDU Academic Team
Published on: August 13, 2026
A metal salt forms a yellow precipitate (P) with potassium iodide solution and black precipitate (Q) with acidified H 2 S. Yellow precipitate (P) dissolve in excess of concentrated solution of KI and ppt.reappears on dilution. Then metal salt could be and also write the chemical equation.
Text Solution
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PbCl 2 + 2KI 
PbI 2 ↓ (yellow) + 2KCl ; PbCl 2 + H 2 S 
PbS ↓ (Black)
PbI 2 + KI(Conc.) 
K 2 (PbI 4 ) (aq)
yellow precipitate of Pbl 2 dissolves in excess KI(conc.) and give PbI 4 2– , ppt reappears on dilution.
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