Chemistry
Lead sulphate can be prepared by the following methods.
P Reacting lead with sulphuric acid.
Q Reacting lead nitrate with sodium sulphate solution.
R Reacting lead oxide with sodium sulphate solution.
(a) Only P
(b) Only Q
(c) Only R
(d) Both Q and R
Acids Bases Salts
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Answer
Only Q
Reason — Insoluble lead sulphate is prepared from insoluble lead carbonate or insoluble lead oxide by first converting them into soluble lead nitrate (with the help of dilute nitric acid).
PbCO₃ + 2HNO₃ → Pb(NO₃)₂ + CO₂ + H₂O
PbO + 2HNO₃ → Pb(NO₃)₂ + H₂O
The resulting solution is then treated with sodium sulphate solution to get lead sulphate as a white precipitate.
Pb(NO₃)₂ + Na₂SO₄ → PbSO₄ ↓ + 2NaNO₃
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