Q. Identify A, B and C in the given below reaction sequence $A\xrightarrow{HNO_3}\mathrm{Pb(NO_3)_2}\xrightarrow{H_2SO_4}B\xrightarrow[(3)\ K_2CrO_4]{(1)\text{ Ammonium acetate},\ (2)\text{ Acetic acid}}C$
A) PbCl₂, PbSO₄, PbCrO₄
B) PbS, PbSO₄, Pb(CH₃COO)₂
C) PbCl₂, Pb(SO₄)₂, PbCrO₄
D) PbS, PbSO₄, PbCrO₄
Explanation
[Solution by Dr. Abubacker] PbS dissolves in hot dilute HNO₃ to give Pb(NO₃)₂ (A = PbS). Pb(NO₃)₂ with H₂SO₄ gives white PbSO₄ (B). PbSO₄ dissolves in ammonium acetate as Pb(CH₃COO)₂; adding K₂CrO₄ precipitates yellow PbCrO₄ (C). Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.