O Levels Chemistry (5070)•5070/11/M/J/18

Explanation
Precipitation of insoluble lead(II) sulfate via double displacement Steps:
- React solid lead(II) carbonate with aqueous sodium sulfate to form insoluble PbSO4 precipitate and soluble Na2CO3.
- Filter the mixture to separate the solid PbSO4 residue from the aqueous filtrate.
- Wash the residue with water to remove impurities like excess sodium sulfate.
- Dry the washed residue to obtain pure solid lead(II) sulfate.
Why B is correct:
- PbCO3(s) + Na2SO4(aq) → PbSO4(s) + Na2CO3(aq); insoluble PbSO4 precipitates and is isolated by washing/drying the residue, yielding pure solid without soluble byproducts contaminating it.
Why the others are wrong:
- A: Crystallizing the filtrate recovers soluble NaNO3, not insoluble PbSO4 residue.
- C: Solid Pb(NO3)2 dissolves in H2SO4 to form PbSO4(s), but crystallizing filtrate yields HNO3, not PbSO4.
- D: H2SO4 reacts with PbCO3 to evolve CO2 gas, risking incomplete reaction or impure residue without specified neutralization.
Final answer: B
Topic: Preparation of salts
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