Question
The reaction of Pb NO 3 2 and NaCl in water produces a precipitate that dissolves upon the addition of HCl of appropriate concentration. The dissolution of the precipitate is due to the formation of
JEE Advanced
Chemistry
p Block Elements (Group 15, 16, 17 & 18)
2022
JEE Advanced 2022 (Paper 2)
JEE Advanced Chemistry Question (2022) — Solution
Options
- A. PbCl 2
- B. PbCl 4
- C. PbCl 4 2 -
- D. PbCl 6 2 -
Answer
C. PbCl 4 2 -
Step-by-step solution
Pb 2 + on reaction with Cl - , produces white precipitate of PbCl 2 Pb 2 + + 2 Cl - ⟶ PbCl 2 ↓ This precipitate is soluble in concentrated hydrochloric acid due to formation of tetrachloroplumbate II ion PbCl 2 ↓ + 2 Cl - ⟶ PbCl 4 2 - On addition of potassium chromate (K2CrO4 ) solution to lead chloride a yellow precipitate of lead chromate is obtained.
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